Medical Dictionary banner
Medical Dictionary - Dictionary of Medicine and Human Biology

Medical Dictionary


reflexotherapy (re-flek′so-thar′a-pe)
SYN: reflex therapy.

reflux (re′fluks)
1. A backward flow. SEE ALSO: regurgitation. 2. In chemistry, to boil without loss of vapor because of the presence of a condenser that returns vapor as liquid. [L. re-, back, + fluxus, a flow] abdominojugular r. SYN: hepatojugular r.. esophageal r., gastroesophageal r. regurgitation of the contents of the stomach into the esophagus, possibly into the pharynx where they can be aspirated between the vocal cords and down into the trachea; symptoms of burning pain and acid taste result; pulmonary complications of aspiration are dependent upon the amount, content, and acidity of the aspirate. hepatojugular r. an elevation of venous pressure visible in the jugular veins and measurable in the veins of the arm, produced in active or impending congestive heart failure and constrictive pericarditis by firm pressure with the flat hand over the abdomen. Often called hepatojugular r. when pressure is exclusively over the liver. SYN: abdominojugular r.. intrarenal r. urinary r. from renal pelvis and calices into the collecting ducts. This is seen as a blush of the renal pyramid on voiding cystourethrography. SYN: pyelotubular r.. pyelotubular r. SYN: intrarenal r.. ureterorenal r. backward flow of urine from ureter into renal pelvis. vesicoureteral r. backward flow of urine from bladder into ureter.

reformat (re-for′mat)
In computed tomography, when data from a series of contiguous transverse scan images are recombined to produce images in a different plane, such as sagittal or coronal.

refract (re-frakt′)
1. To change the direction of a ray of light. 2. To detect an error of refraction and to correct it by means of lenses. [L. refringo, pp. -fractus, to break up]

refractable (ri-frak′ta-bil)
Subject to refraction. SYN: refrangible.

refraction (re-frak′shun)
1. The deflection of a ray of light when it passes from one medium into another of different optical density; in passing from a denser into a rarer medium it is deflected away from a line perpendicular to the surface of the refracting medium; in passing from a rarer to a denser medium it is bent toward this perpendicular line. 2. The act of determining the nature and degree of the refractive errors in the eye and correction of the same by lenses. SYN: refringence. [L. refractio (see refract)] double r. the property of having more than one refractive index according to the direction of the transmitted light. SYN: birefringence. dynamic r. r. of the eye during accommodation. static r. r. without accommodation.

refractionist (re-frak′shun-ist)
A person trained to measure the refraction of the eye and to determine the proper corrective lenses.

refractionometer (re-frak-shun-om′e-ter)
SYN: refractometer.

refractive (re-frak′tiv)
1. Pertaining to refraction. 2. Having the power to refract. SYN: refringent.

refractivity (re-frak-tiv′i-te)
Refractive power. SYN: refringency.

refractometer (re-frak-tom′e-ter)
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media. See refractive index. SYN: objective optometer, refractionometer. [refraction + G. metron, measure]

refractometry (re-frak-tom′e-tre)
1. Measurement of the refractive index. 2. Use of a refractometer to determine the refractive error of the eye.

refractory (re-frak′tor-e)
1. Resistant to treatment, as of a disease. SYN: intractable (1) , obstinate (2) . 2. SYN: obstinate (1) . [L. refractarius, fr. refringo, pp. -fractus, to break in pieces]

refracture (re-frak′choor)
Breaking a bone that has united after a previous fracture with the new fracture occurring at or near the previous fracture site. [re- + fracture]

refrangible (re-fran′ji-bl)
SYN: refractable. [L. refringo, to break in pieces]

refresh (re-fresh′)
1. To renew; to cause to recuperate. 2. To perform revivification (2). [O. Fr. re-frescher]

refrigerant (re-frij′er-ant)
1. Cooling; reducing slight fever. 2. An agent that gives a sensation of coolness or relieves feverishness. [L. re-frigero, pp. -atus, pr. p. -ans, to make cold, fr. frigus (frigor-), cold]

refrigeration (re-frij-er-a′shun)
The act of cooling or reducing fever. [L. refrigeratio (see refrigerant)]

refringence (re-frin′jens)
SYN: refraction.

refringency (re-frin′jen-se)
SYN: refractivity.

refringent (re-frin′jent)
SYN: refractive.

Sigvald, Norwegian neurologist, *1907. See R. disease, R. syndrome.

refusion (re-foo′zhun)
Return of the circulation of blood which has been temporarily cut off by ligature of a limb. [L. re-fundo, pp. -fusus, to pour back]

regainer (re-gan′er)
An appliance used in an attempt to regain space in the dental arches.

Claude, French radiologist, 1870–1940. See R. fixative, residual body of R..

regenerate (re-jen′er-at)
To renew; to reproduce. [L. re- genero, pp. -atus, to reproduce, fr. genus (gener-), birth, race]

regeneration (re′jen-er-a′shun)
1. Reproduction or reconstitution of a lost or injured part. SYN: neogenesis. 2. A form of asexual reproduction; e.g., when a worm is divided into two or more parts, each segment is regenerated into a new individual. [L. regeneratio (see regenerate)] aberrant r. misdirected regrowth of nerve fibers seen, for example, after oculomotor nerve injury. SYN: misdirection phenomenon. guided tissue r. r. of tissue directed by the physical presence and/or chemical activities of a biomaterial; often involves placement of barriers to exclude one or more cell types during healing or r. of tissue.

regimen (rej′i-men)
A program, including drugs, which regulates aspects of one's lifestyle for a hygienic or therapeutic purpose; a program of treatment; sometimes mistakenly called regime. [L. direction, rule]

regio, gen. regionis, pl .regiones (re′je-o, -o′nis, -o′nez) [TA]
SYN: region. [L.] regiones abdominis [TA] SYN: abdominal regions, under region. r. abdominis lateralis flank. r. analis [TA] SYN: anal triangle. r. antebrachialis anterior anterior region of forearm. r. antebrachialis posterior posterior region of forearm. r. antebrachii anterior [TA] SYN: anterior region of forearm. r. antebrachii posterior [TA] SYN: posterior region of arm. r. axillaris [TA] SYN: axillary region. r. brachialis anterior anterior region of arm. r. brachialis posterior posterior region of arm. r. brachii anterior [TA] SYN: anterior region of arm. r. buccalis [TA] SYN: buccal region. r. calcanea [TA] SYN: heel region. regiones capitis [TA] SYN: regions of head, under region. r. carpalis anterior [TA] SYN: anterior region of wrist. r. carpalis posterior [TA] SYN: posterior region of wrist. regiones cervicales [TA] SYN: regions of neck, under region. r. cervicalis anterior [TA] SYN: anterior cervical region. r. cervicalis lateralis [TA] SYN: lateral cervical region. r. cervicalis posterior [TA] SYN: posterior cervical region. r. colli posterior posterior cervical region. regiones corporis SYN: regions of body, under region. r. cruralis posterior [TA] SYN: posterior region of leg. r. cruris anterior [TA] SYN: anterior region of leg. r. cubitalis anterior [TA] SYN: anterior region of elbow. r. cubitalis posterior posterior region of elbow. r. deltoidea [TA] SYN: deltoid region. regiones dorsales [TA] SYN: regions of back, under region. regiones dorsi regions of back, under region. r. epigastrica epigastric region. r. facialis [TA] SYN: face region. r. femoralis posterior SYN: posterior region of thigh. r. femoris [TA] SYN: femoral region. r. femoris anterior [TA] SYN: anterior region of thigh. r. femoris posterior [TA] SYN: posterior region of thigh. r. frontalis capitis [TA] SYN: frontal region of head. r. genus anterior [TA] SYN: anterior region of knee. r. genus posterior [TA] SYN: posterior region of knee. r. glutealis [TA] SYN: gluteal region. r. hypochondriaca hypochondriac region. r. infraclavicularis SYN: infraclavicular fossa. r. inframammaria [TA] SYN: inframammary region. r. infraorbitalis [TA] SYN: infraorbital region. r. infrascapularis [TA] SYN: infrascapular region. r. inguinalis groin (1) . r. lateralis abdominis flank. r. lumbalis [TA] SYN: lumbar region. r. mammaria [TA] SYN: mammary region. regiones membri inferioris [TA] SYN: regions of lower limb, under region. regiones membri superioris [TA] SYN: regions of upper limb, under region. r. mentalis [TA] SYN: mental region. r. nasalis [TA] SYN: nasal region. r. nuchalis SYN: posterior cervical region. r. occipitalis capitis [TA] SYN: occipital region of head. r. olfactoria tunicae mucosae nasi SYN: olfactory region of nasal mucosa. r. oralis [TA] SYN: oral region. r. orbitalis [TA] SYN: orbital region. r. parietalis capitis [TA] SYN: parietal region. r. pectoralis [TA] SYN: pectoral region. r. perinealis [TA] SYN: perineal region. r. plantaris sole of foot. r. presternalis [TA] SYN: presternal region. r. pubica pubic region. r. respiratoria tunicae mucosae nasi SYN: respiratory region of mucosa of nasal cavity. r. sacralis [TA] SYN: sacral region. r. scapularis [TA] SYN: scapular region. r. sternocleidomastoidea [TA] SYN: sternocleidomastoid region. r. suralis [TA] SYN: sural region, sural region. r. talocruralis SYN: ankle region. r. tarsalis [TA] SYN: ankle region. r. temporalis capitis [TA] SYN: temporal region of head. regiones thoracicae anteriores et laterales [TA] SYN: anterior and lateral thoracic regions, under region. r. umbilicalis [TA] SYN: umbilical region. r. urogenitalis [TA] SYN: urogenital triangle. r. vertebralis [TA] SYN: vertebral region. r. zygomatica [TA] SYN: zygomatic region.

region (re′jun) [TA]
1. An often arbitrarily limited portion of the surface of the body. SEE ALSO: space, zone. 2. A portion of the body having a special nervous or vascular supply, or a part of an organ having a special function. SEE ALSO: area, space, spatium, zone. SYN: regio [TA] . [L. regio] abdominal regions [TA] the topographic subdivisions of the abdomen; based on subdividing the abdomen by the transpyloric, interspinous, and midclavicular planes; including the right and left hypochondrium, right and left flank or lateral, right and left groin or inguinal, and the unpaired epigastric, umbilical, and pubic regions. SYN: regiones abdominis [TA] , abdominal zones. anal r. SYN: anal triangle. ankle r. [TA] the r. of the lower limb between the leg (crus) and the foot (pes). SYN: regio tarsalis [TA] , regio talocruralis. anterior antebrachial r. SYN: anterior r. of forearm. anterior r. of arm [TA] area between deltoid r. superiorly and anterior r. of elbow inferiorly. SYN: regio brachii anterior [TA] , regio brachialis anterior&star, anterior surface of arm, facies anterior brachii, facies brachialis anterior. anterior brachial r. the anterior r. of the arm. anterior carpal r. SYN: anterior r. of wrist. anterior cervical r. [TA] the area of the neck bounded by the mandible, the anterior border of the sternocleidomastoid muscle, and the anterior midline of the neck; it is subdivided into carotid, muscular, submandibular, and submental triangles. SYN: regio cervicalis anterior [TA] , anterior triangle of neck&star, trigonum cervicale anterius&star, trigonum colli anterius&star, anterior r. of neck. anterior crural r. SYN: anterior r. of leg. anterior cubital r. SYN: anterior r. of elbow. anterior r. of elbow [TA] the area in front of the elbow, including the cubital fossa. SYN: regio cubitalis anterior [TA] , anterior cubital r., anterior surface of elbow, facies cubitalis anterior. anterior r. of forearm [TA] the area between the radial and ulnar borders of the forearm anteriorly. SYN: regio antebrachii anterior [TA] , regio antebrachialis anterior&star, anterior antebrachial r., anterior surface of forearm, facies antebrachialis anterior, facies anterior antebrachii. anterior hypothalamic r. anterior hypothalamic area. anterior knee r. SYN: anterior r. of knee. anterior r. of knee [TA] the anterior r. of the knee. SYN: regio genus anterior [TA] , anterior knee r.. anterior and lateral thoracic regions [TA] the topographic divisions of the chest: presternal, pectoral, and axillary. SYN: regiones thoracicae anteriores et laterales [TA] , regions of chest. anterior r. of leg [TA] the anterior surface of the inferior limb between the knee and the ankle. SYN: regio cruris anterior [TA] , anterior crural r., anterior surface of leg, facies anterior cruris, facies cruralis anterior. anterior r. of neck SYN: anterior cervical r.. anterior r. of thigh [TA] the front of the thigh, including the femoral triangle. SYN: regio femoris anterior [TA] , anterior surface of thigh, facies femoralis anterior. anterior r. of wrist [TA] the anterior part of the wrist. SYN: regio carpalis anterior [TA] , anterior carpal r.. axillary r. [TA] the r. of the axilla, including the axillary fossa. SYN: regio axillaris [TA] . regions of back [TA] the topographic regions of the back of the trunk, including the vertebral r., sacral r., scapular r., infrascapular r., and lumbar r.. SYN: regiones dorsales [TA] , regiones dorsi&star. regions of body the topographic divisions of the body. SYN: regiones corporis. buccal r. [TA] the r. of the cheek, corresponding approximately to the outlines of the underlying buccinator muscle. SYN: regio buccalis [TA] . calcaneal r. SYN: heel r.. regions of chest SYN: anterior and lateral thoracic regions. chromosomal r. that part of a chromosome defined either by anatomical details, notably banding, or by its linkages (linkage group). complementarity determining regions that part of an antibody or T cell receptor variable r. that binds with antigen or antigen/major histocompatibility molecule. constant r. immunoglobulin. deltoid r. [TA] the lateral aspect of the shoulder demarcated by the outlines of the deltoid muscle. SYN: regio deltoidea [TA] . dorsal hypothalamic r. dorsal hypothalamic area. epigastric r. [TA] the r. of the abdomen located between the costal margins and the subcostal plane. (TA lists this term as synonymous with epigastric fossa. SYN: epigastrium [TA] , regio epigastrica&star. regions of face SYN: face r.. face r. [TA] the topographic subdivisions of the face, including nasal, oral, mental, orbital, infraorbital, buccal, parotid, and zygomatic. SYN: regio facialis [TA] , regions of face. femoral r. [TA] the r. of the thigh between hip and knee. SYN: regio femoris [TA] . framework r. in immunology, a conserved sequence of amino acids on either side of the hypervariable regions in the variable domains of an immunoglobulin chain. frontal r. of head [TA] the surface r. of the head corresponding to the outlines of the frontal bone. SYN: regio frontalis capitis [TA] . gluteal r. [TA] the r. of the buttocks. SYN: regio glutealis [TA] . regions of head [TA] the topographic division of the cranium in relation to the bones of the cranial vault; the regions include frontal, parietal, occipital, temporal, auricular, mastoid, and facial. SYN: regiones capitis [TA] . heel r. [TA] the r. of the heel. SYN: regio calcanea [TA] , calcaneal r.. hinge r. 1. that part of a tRNA structure that is deformed, bending a “cloverleaf” (two-dimensional) model to form an “L” model (crystal form, as seen by electron microscopy); 2. in an immunoglobulin, a short sequence of amino acids that lies between two longer sequences and allows the latter to bend about the former. hypervariable regions (hi-per′var-i-a-ble) the regions of the immunoglobulin molecule that contain most of the residues involved in the antibody binding site. hypochondriac r. the r. on each side of the abdomen covered by the costal cartilages; it is lateral to the epigastric r.. SYN: hypochondrium [TA] , regio hypochondriaca&star. I r. that area of the H-2 complex of mice that contains Class II major histocompatibility complex genes. iliac r. SYN: groin (1) . regions of inferior limb SYN: regions of lower limb. inframammary r. [TA] the r. of the chest (portion of pectoral r.) inferior to the mammary gland. SYN: regio inframammaria [TA] . infraorbital r. [TA] the facial r. below the orbit and lateral to the nose on each side. SYN: regio infraorbitalis [TA] . infrascapular r. [TA] the r. of the back lateral to the vertebral r. and below the scapula. SYN: regio infrascapularis [TA] . inguinal r. groin (1) . r. of interest in computed tomography or other computerized imaging, an interactively selected portion of the image, the individual or average pixel values of which can be displayed numerically. intermediate r. [TA] SYN: intermediate column. intermediate hypothalamic r. intermediate hypothalamic area. K r. carbons 9 and 10 of the phenanthrene ring system; thought by some to be the reactive spot in the various hydrocarbon carcinogens. lateral abdominal r. flank. lateral r. of abdominal r. flank. lateral cervical r. [TA] the r. of the neck bounded by the sternocleidomastoid muscle, the trapezius muscle, and the upper border of the clavicle, including the omoclavicular triangle. SYN: regio cervicalis lateralis [TA] , posterior triangle of neck&star, trigonum cervicale posterius&star, trigonum colli laterale&star, lateral r. of neck. lateral hypothalamic r. extends throughout most of the rostrocaudal extent of the hypothalamus lateral to the column of the fornix; includes lateral tuberal nuclei, tuberomamillary nuclei, and diffuse populations of cells. lateral r. of neck SYN: lateral cervical r.. regions of lower limb [TA] the topographic divisions of the lower limb: gluteal, hip, femoral, knee, leg, ankle, and foot. SYN: regiones membri inferioris [TA] , regions of inferior limb. lumbar r. [TA] the r. of the back lateral to the vertebral r. and between the rib cage and the pelvis. SYN: regio lumbalis [TA] . mammary r. [TA] the r. of the chest (pectoral r.) that includes the breast. SYN: regio mammaria [TA] . mental r. [TA] the r. of the chin. SYN: regio mentalis [TA] . nasal r. [TA] the r. of the nose. SYN: regio nasalis [TA] . regions of neck [TA] the topographic subdivisions of the neck. SYN: regiones cervicales [TA] . nuchal r. SYN: posterior cervical r.. nucleolus organizer r. an arrangement of the DNA coding for the production of ribosomal RNA (rRNA). occipital r. of head [TA] the surface r. of the head corresponding to the outlines of the occipital bone. SYN: regio occipitalis capitis [TA] . r. of olfactory mucosa SYN: olfactory r. of nasal mucosa. olfactory r. of mucosa of nose [TA] epithelium containing nerve cells whose axons form the filaments of the olfactory nerve; the lamina propria contains numerous olfactory glands (Bowman) that open to the surface. SYN: olfactory mucosa. olfactory r. of nasal mucosa [TA] the specialized olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha; it is lined with olfactory mucosa. SYN: pars olfactoria tunicae mucosae [TA] , olfactory r. of tunica mucosa of nose, regio olfactoria tunicae mucosae nasi, r. of olfactory mucosa, Schultze membrane. olfactory r. of nose [TA] that part of the nasal mucosa having olfactory receptor cells and glands of Bowman. SYN: olfactory membrane. olfactory r. of tunica mucosa of nose SYN: olfactory r. of nasal mucosa. oral r. [TA] the r. of the face including the lips and mouth. SYN: regio oralis [TA] . orbital r. [TA] the r. about the orbit. SYN: regio orbitalis [TA] . parietal r. [TA] the surface r. of the head corresponding to the outlines of the underlying parietal bone. SYN: regio parietalis capitis [TA] . pectoral r. [TA] the r. of the chest demarcated by the outline of the pectoralis major muscle; includes lateral pectoral, mammillary, and inframammary regions. SEE ALSO: anterior and lateral thoracic regions. SYN: regio pectoralis [TA] . perineal r. [TA] the regio at the lower end of the trunk, anterior to the sacral r. and posterior to the pubic r. between the thighs; it is divided into the anal triangle posteriorly and the urogenital triangle anteriorly. SYN: regio perinealis [TA] . plantar r. sole of foot. popliteal r. SYN: popliteal fossa. posterior antebrachial r. SYN: posterior r. of forearm. posterior r. of arm [TA] the back of arm. SYN: regio antebrachii posterior [TA] , regio brachialis posterior&star, facies brachialis posterior, posterior brachial r., posterior surface of arm. posterior brachial r. SYN: posterior r. of arm. posterior carpal r. SYN: posterior r. of wrist. posterior cervical r. [TA] the back of neck, including the suboccipital r.. SYN: regio cervicalis posterior [TA] , regio colli posterior&star, nuchal r., posterior neck r., posterior r. of neck, regio nuchalis. posterior crural r. SYN: posterior r. of leg. posterior cubital r. SYN: posterior r. of elbow. posterior r. of elbow [TA] the back of the elbow. SYN: regio cubitalis posterior&star, facies cubitalis posterior, posterior cubital r., posterior surface of elbow. posterior r. of forearm [TA] the area between the radial and ulnar borders of the forearm posteriorly. SYN: regio antebrachialis posterior&star, facies antebrachialis posterior, posterior antebrachial r., posterior surface of forearm. posterior hypothalamic r. caudal portions of the hypothalamus located internally in the area of the mamillary body, includes medial, intermediate, and lateral mamillary nuclei and the posterior hypothalamic nuclei. SEE ALSO: posterior hypothalamic area. posterior knee r. SYN: posterior r. of knee. posterior r. of knee [TA] the posterior r. of the knee, including the popliteal fossa. SYN: regio genus posterior [TA] , posterior knee r.. posterior r. of leg [TA] the back of the leg. SYN: regio cruralis posterior [TA] , facies cruralis posterior, facies posterior cruris, posterior crural r., posterior surface of leg. posterior r. of neck SYN: posterior cervical r.. posterior neck r. SYN: posterior cervical r.. posterior r. of thigh [TA] the back of the thigh. SYN: regio femoris posterior [TA] , facies femoralis posterior, posterior surface of thigh, regio femoralis posterior. posterior r. of wrist [TA] the posterior part of the wrist. SYN: regio carpalis posterior [TA] , posterior carpal r.. preoptic r. the most anterior part of the hypothalamus surrounding the anterior or preoptic part of the third ventricle and including the lamina terminalis; containing the lateral and medial preoptic nucleus continuous caudally with, respectively, the lateral and anterior hypothalamic nucleus; rostrally the preoptic r. is continuous with the precommissural septum, laterally with the innominate substance. SYN: area preoptica [TA] , preoptic area [TA] . presternal r. [TA] the part of the chest over the sternum. SYN: regio presternalis [TA] . presumptive r. in experimental embryology, an area of the blastula from which a specific tissue or organ may be expected to develop. pretectal r. SYN: pretectal area. pubic r. [TA] the lower central r. of the abdomen below the umbilical r. and superior to the mons pubis. SYN: hypogastrium [TA] , regio pubica&star. r. of respiratory mucosa SYN: respiratory r. of mucosa of nasal cavity. respiratory r. of mucosa of nasal cavity [TA] the area commencing at the vestibule of the nose lined with respiratory mucosa; with the exception of the olfactory mucusa, it includes the entire nasal cavity. SYN: pars respiratoria tunicae mucosae [TA] , regio respiratoria tunicae mucosae nasi, r. of respiratory mucosa, respiratory r. of tunica mucosa of nose. respiratory r. of tunica mucosa of nose SYN: respiratory r. of mucosa of nasal cavity. sacral r. [TA] the area of the back overlying the sacrum. SYN: regio sacralis [TA] . scaffold-associated regions (SAR) sites in DNA that bind topoisomerase II and other scaffold proteins; found in introns. scapular r. [TA] the area of the back corresponding to the outlines of the scapula. SYN: regio scapularis [TA] . sternocleidomastoid r. [TA] the r. overlying the sternocleidomastoid muscle, including the lesser supraclavicular fossa. SYN: regio sternocleidomastoidea [TA] . suboccipital r. upper back of neck, inferior to occipital r. of head and above the level of the second cervical vertebra; overlies (or includes, deeply) the suboccipital triangle. regions of superior limb SYN: regions of upper limb. sural r. [TA] the muscular swelling of the back of the leg below the knee, formed chiefly by the bellies of the gastrocnemius and soleus muscles. SYN: regio suralis [TA] . temporal r. of head [TA] the surface r. of the head corresponding approximately to the outlines of the temporal bone. SYN: regio temporalis capitis [TA] . umbilical r. [TA] the central r. of the abdomen about the umbilicus. SYN: regio umbilicalis [TA] . regions of upper limb [TA] the topographic divisions of the upper limb: deltoid, arm, brachial, cubital, antebrachial, carpal, and hand. SYN: regiones membri superioris [TA] , regions of superior limb. urogenital r. SYN: urogenital triangle. variable r. immunoglobulin. vertebral r. [TA] the central r. of the back, corresponding to the underlying vertebral column. SYN: regio vertebralis [TA] . Wernicke r. SYN: Wernicke center. zygomatic r. [TA] the r. of the face outlined by the zygomatic bone; the prominence above the cheek. SYN: regio zygomatica [TA] .

regional (re′jun-al)
Relating to a region.

regiones (re′je-o′nez)
Plural of regio. [L.]

register (rej′is-ter)
The file of data concerning all cases of a specified condition, such as cancer, occurring in a defined population; the r. is the actual document, and the registry is the system of ongoing registration. [Mediev. L. registrum, fr. L.L. regero, pp. regestum to record]

registration (rej-is-tra′shun)
In dentistry, a record. maxillomandibular r. SYN: maxillomandibular record. tissue r. in dentistry, 1. the accurate r. of the shape of tissues under any condition by means of a suitable material; 2. an impression.

registry (rej′is-tre)
1. An organization that lists professionals in certain fields. 2. An agency for the collection of pathologic material and related information and the organization of these materials for the purpose of study. 3. An agency for the collection of data on individuals who have had a certain disease to allow follow-up and evaluation of response to therapy.

regnancy (reg′nan-se)
The briefest unit of experience; the unit composed of the total physiologic processes occurring at a single moment, which constitute dominant configurations in the brain. A single process constituting part of the r. is referred to as a regnant process. [L. regnant-, regnans, pres. p. of regno, to rule]

regression (re-gresh′un)
1. A subsidence of symptoms. 2. A relapse; a return of symptoms. 3. Any retrograde movement or action. 4. A return to a more primitive mode of behavior due to an inability to function adequately at a more adult level. 5. The tendency for offspring of exceptional parents to possess characteristics closer to those of the general population. 6. An unconscious defense mechanism by which there occurs a return to earlier patterns of adaptation. 7. The distribution of one random variable given particular values of other variables relevant to it, e.g., a formula for the distribution of weight as a function of height and chest circumference. The method was formulated by Galton in his study of quantitative genetics. [L. regredior, pp. -gressus, to go back] phonemic r. a decrease in intelligibility of speech associated with aging.

regressive (re-gres′iv)
Relating to or characterized by regression.

regulation (reg′u-la′shun)
1. Control of the rate or manner in which a process progresses or a product is formed. 2. In experimental embryology, the power of a pregastrula embryo to continue approximately normal development after a part or parts have been manipulated or destroyed. [L. regula, a rule] enzyme r. control of the rate of a reaction catalyzed by an enzyme by some effector ( E.G., inhibitors or activators) or by alteration of some condition ( E.G., pH or ionic strength). gene r. control of protein synthesis by means of activation or inhibition of that protein synthesis.

regulator (reg-u-la′tor)
A substance or process that controls another substance or process. growth regulators substances that can alter the growth of a living organism. humoral r. a substance whose action is a result of contact with targets for activity through blood or body fluids.

regulon (reg′u-lon)
A set of structural genes, all with the same gene regulation, whose gene products are involved in the same reaction pathway.

regurgitant (re-ger′ji-tant)
Regurgitating; flowing backward.


. . . Feedback