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Medical Dictionary


rhagadiform (ra-gad′i-form)
Resembling or characterized by rhagades. [G. rhagas (rhagad-), crack, + L. forma, shape]

See -rrhagia.

rhamnoside (ram′no-sid)
A glycoside of rhamnose.

rhamnoxanthin (ram-no-zan′thin)
SYN: frangulin.

Rhamnus (ram′nus)
A genus of shrubs and trees (family Rhamnaceae). The bark and berries of R. cathartica are cathartic; R. frangula is the source of frangula; R. purshiana is the source of cascara sagrada. SYN: buckthorn. [G. rhamnos]

rhaphania (ra-fa′ne-a)
SYN: raphania.

rhaphe (ra′fe)
SYN: raphe.

See -rrhaphy.

rhe (re)
The absolute unit of fluidity, the reciprocal of the unit of viscosity. [G. rheos, a stream]

See -rrhea.

rhegma (reg′ma)
A rent or fissure. [G. breakage]

rhegmatogenous (reg-ma-toj′e-nus)
Arising from a bursting or fractionating of an organ. See r. retinal detachment. [G. rhegma, breakage, + -gen, producing]

rheic (re′ik)
Relating to Rheum (rhubarb).

Rheinberg microscope
See under microscope.

rhenium (Re) (re′ne-um)
A metallic element of the platinum group; atomic wt. 186.207, atomic no. 75. [Mod. L., fr. L. Rhenus, Rhine river]

Blood flow; electrical current. [G. rheos, stream, current, flow]

rheobase (re′o-bas)
The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, e.g., muscle or nerve. SEE ALSO: chronaxie. SYN: galvanic threshold. [rheo- + G. basis, a base]

rheobasic (re-o-ba′sik)
Pertaining to or having the characteristics of a rheobase.

rheocardiography (re′o-kar-de-og′ra-phe)
Impedance plethysmography applied to the heart. [rheo- + cardiography]

rheochrysidin (re-o-kris′i-din)
The 3-methyl ether of emodin.

rheoencephalogram (re′o-en-sef′a-lo-gram)
Graphic registration of the changes in conductivity of tissue of the head caused by vascular factors.

rheoencephalography (re′o-en-sef-a-log′ra-fe)
The technique of measuring blood flow of the brain; commonly used to denote impedance r., which uses changes in electrical impedance and resistance as a measure of flow. [rheo- + encephalography]

rheogram (re′o-gram)
A plot of the shear stress versus the shear rate for a fluid. [rheo- + G. gramma, something written]

rheologist (re-ol′o-jist)
A specialist in rheology.

rheology (re-ol′o-je)
The study of the deformation and flow of materials. [rheo- + G. logos, study]

rheometer (re-om′e-ter)
1. An instrument for measurement of the rheologic properties of materials, e.g., of blood. 2. A galvanometer. [rheo- + G. metron, measure]

rheometry (re-om′e-tre)
Measurement of electrical current or blood flow.

rheopexy (re′o-pek-se)
A property of certain materials in which an increased rate of shear favors an increase in viscosity. [rheo- + G. pexis, fixation]

rheostat (re′o-stat)
A variable resistor used to adjust the current in an electrical circuit. [rheo- + G. statos, stationary]

rheostosis (re-os-to′sis)
A hypertrophying and condensing osteitis that tends to run in longitudinal streaks or columns, like wax drippings on a candle, and that involves a number of the long bones. SYN: flowing hyperostosis, streak hyperostosis. [rheo- + G. osteon, bone, + -osis, condition]

rheotaxis (re-o-tak′sis)
A form of positive barotaxis, in which a microorganism in a fluid is impelled to move against the current flow of its medium. [rheo- + G. taxis, orderly arrangement]

rheotropism (re-ot′ro-pizm)
A movement contrary to the motion of a current, involving part of an organism, rather than the organism as a whole, as in rheotaxis. [rheo- + G. tropos, a turning]

rhestocythemia (res′to-si-the′me-a)
An obsolete term for the presence of broken-down red blood cells in the peripheral circulation. [G. rhaio, to destroy, + kytos, a hollow (a cell), + haima, blood]

rhesus (re′sus)
Generic name for Macaca mulatta. [Mod. L., fr. L. R., G. Rhesos, a mythical king of Thrace]

rheum (room)
A mucous or watery discharge. [G. rheuma, a flux]

rheumatalgia (roo-ma-tal′je-a)
Obsolete term for rheumatic pain. [G. rheuma, flux, + algos, pain]

rheumatic (roo-mat′ik)
Relating to or characterized by rheumatism. SYN: rheumatismal. [G. rheumatikos, subject to flux, fr. rheuma, flux]

rheumatid (roo′ma-tid)
Rheumatic nodules or other eruptions that may accompany rheumatism. [G. rheum, flux, + -id (1)]

rheumatism (roo′ma-tizm)
1. Obsolete term for rheumatic fever. 2. Indefinite term applied to various conditions with pain or other symptoms of articular origin or related to other elements of the musculoskeletal system. [G. rheumatismos, rheuma, a flux] articular r. SYN: arthritis. cerebral r. central nervous system symptoms resulting from a rheumatic disease. Formerly seen primarily as a manifestation of rheumatic fever, now seen less frequently as a part of other diseases such as systemic lupus erythematosus. SEE ALSO: Sydenham chorea. chronic r. a nonspecific disorder of the joints, slow in progress, producing a painful thickening and contraction of the fibrous structures, interfering with motion, and causing deformity. gonorrheal r. an arthritis, usually initially a polyarthritis, but often localizing in one joint as a pyarthrosis caused by systemic infection with the gonococcus. r. of the heart rheumatic cardiac valvular disease, most often of the mitral and aortic valves. inflammatory r. rheumatoid arthritis or other cause of joint inflammation. Macleod r. rheumatoid arthritis with abundant serous effusion in the affected joints. muscular r. SYN: fibrositis (2) . nodose r. 1. SYN: rheumatoid arthritis. 2. an acute or subacute articular r., accompanied by the formation of nodules on the tendons, ligaments, and periosteum in the neighborhood of the affected joints. subacute r. a mild but usually protracted form of acute rheumatic fever, often resistant to treatment. tuberculous r. an inflammatory condition of the joints or fibrous tissues during the course of tuberculosis.

rheumatismal (roo-ma-tiz′mal)
SYN: rheumatic.

rheumatoid (roo′ma-toyd)
Resembling r. arthritis in one or more features. [G. rheuma, flux, + eidos, resemblance]

rheumatologist (roo-ma-tol′o-jist)
A specialist in rheumatology.

rheumatology (roo-ma-tol′o-je)
The medical specialty concerned with the study, diagnosis, and treatment of rheumatic conditions. [G. rheuma, flux, + logos, study]

rhigotic (ri-got′ik)
Pertaining to rhigosis.

SYN: recombinant human interleukin 11.

rhin-, rhino-
The nose. [G. rhis]

rhinal (ri′nal)
SYN: nasal.

rhinalgia (ri-nal′je-a)
Pain in the nose. SYN: rhinodynia. [rhin- + G. algos, pain]

rhinedema (ri′ne-de′ma)
Swelling of the nasal mucous membrane. [rhin- + G. oidema, swelling]

rhinencephalic (ri′nen-se-fal′ik)
Relating to the rhinencephalon.

rhinencephalon (ri′nen-sef′a-lon)
A largely archaic collective term denoting the parts of the cerebral hemisphere directly related to the sense of smell: the olfactory bulb, olfactory peduncle (together still listed as the first cranial nerve or olfactory nerve despite the fact that they form part of the central nervous system), olfactory tubercle, and olfactory or piriform cortex including the cortical nucleus of the amygdala. The term originally also encompassed the hippocampus, the entire amygdala, and the fornicate gyrus, all of which are no longer believed to be specifically related to the sense of smell. SEE ALSO: limbic system. SYN: smell-brain. [rhin- + G. enkephalos, brain]

rhinenchysis (ri-nen′ki-sis)
A nasal douche; washing out the nasal cavities. [rhin- + G. enchysis, a pouring in]

rhinion (rin′e-on)
A craniometric point: the lower end of the internal suture. [G. r., nostril, dim. of rhis (rhin-), nose]

rhinism (ri′nizm)
SYN: rhinolalia.

rhinitis (ri-ni′tis)
Inflammation of the nasal mucous membrane. SYN: nasal catarrh. [rhin- + G. -itis, inflammation] acute r. an acute catarrhal inflammation of the mucous membrane of the nose, marked by sneezing, lacrimation, and a profuse secretion of watery mucus; usually associated with infection by one of the common cold viruses. SYN: coryza, head cold. allergic r. r. associated with hay fever. atrophic r. chronic r. with thinning of the mucous membrane; often associated with crusts and foul-smelling discharge. SYN: ozena. r. caseosa, caseous r. a form of chronic r. in which the nasal cavities are more or less completely filled with an ill-smelling cheesy material. chronic r. a protracted sluggish inflammation of the nasal mucous membrane; in the later stages the mucous membrane with its glands may be thickened (hypertrophic r.) or thinned (atrophic r.). gangrenous r. cancrum nasi. hypertrophic r. chronic r. with permanent thickening of the mucous membrane. r. medicamentosa inflammation of the nasal mucous membrane secondary to excessive or improper topical medication. scrofulous r. tuberculous infection of the nasal mucous membrane. r. sicca a form of chronic r. with little or no secretion. vasomotor r. congestion of nasal mucous membrane and rhinorrhea without infection or allergy.

See rhin-.

rhinoanemometer (ri′no-an-e-mom′e-ter)
SYN: rhinomanometer. [rhino- + G. anemos, wind, + metron, measure]

rhinocele (ri′no-sel)
Cavity (ventricle) of the rhinencephalon, the primitive olfactory part of the telencephalon. [rhino- + G. koilia, a hollow]

rhinocephaly, rhinocephalia (ri′no-sef′a-le, -se-fa′le-a)
Rhinencephaly;a form of cyclopia in which the nose is represented by a fleshy proboscis-like protuberance arising above the slitlike orbits, and the rhinencephalic lobes of the telencephalon are poorly developed with some tendency to become fused together. [rhino- + G. kephale, head]

Rhinocladiella (ri′no-klad-e-el′a)
A genus of dematiaceous (dark colored) fungi, characterized by acrotheca, that cause chromoblastomycosis. SEE ALSO: Phialophora.

rhinocleisis (ri-no-kli′sis)
SYN: rhinostenosis. [rhino- + G. kleisis, a closure]

rhinodymia (ri-no-dim′e-a)
Duplication of the nose on an otherwise normal face. [rhino- + G. -dymos, fold]

rhinodynia (ri-no-din′e-a)
SYN: rhinalgia. [rhino- + G. odyne, pain]

rhinoestrosis (ri′no-es-tro′sis)
Infection of horses and donkeys, rarely humans, with larvae of the fly Rhinoestrus purpureus; human infection is usually benign and of short duration, limited to the first stage of the larva and resulting in a mild ophthalmomyiasis.

Rhinoestrus purpureus (ri-no-es′trus pur-poo′re-us)
A species of fly of the family Oestridae, the nasal botflies, that causes rhinoestrosis.

rhinogenous (ri-noj′e-nus)
Originating in the nose. [rhino- + G. -gen, producing]

rhinokyphosis (ri′no-ki-fo′sis)
A hump deformity of the nose. [rhino- + G. kyphosis, humped condition]

rhinolalia (ri′no-la′le-a)
Nasalized speech. SYN: rhinism, rhinophonia. [rhino- + G. lalia, talking] r. aperta abnormal speech attributable to inadequate velopharyngeal closure. r. clausa abnormal speech attributable to nasal obstruction.

rhinolite (ri′no-lit)
SYN: rhinolith.

rhinolith (ri′no-lith)
A calcareous concretion in the nasal cavity often around a foreign body. SYN: nasal calculus, rhinolite. [rhino- + G. lithos, stone]


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