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Medical Dictionary


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variation (var-e-a′shun)
1. Deviation from the type, especially the parent type, in structure, form, physiology, or behavior. 2. SYN: type (3) . [L. variatio, fr. vario, to change, vary] continuous v. a series of very slight variations.

varication (var-i-ka′shun)
Formation or presence of varices.

variceal (var-i-se′al, va-ris′e-al)
Of or pertaining to a varix.

varicella (var-i-sel′a)
An acute contagious disease, usually occurring in children, caused by the v.-zoster virus genus, Varicellovirus, a member of the family Herpesviridae, and marked by a sparse eruption of papules, which become vesicles and then pustules, like that of smallpox although less severe and varying in stages, usually with mild constitutional symptoms; incubation period is about 14–17 days. SEE ALSO: herpes zoster. SYN: chickenpox. [Mod. L. dim. of variola] v. gangrenosa gangrenous ulceration of v. lesions with or without secondary infection, occurring mainly in children with severe underlying disease.

varicellation (var-i-se-la′shun)
Inoculation with the virus of chickenpox as a means of protection against that disease.

varicelliform (var-i-sel′i-form)
Resembling varicella. SYN: varicelloid.

varicelloid (var-i-sel′oyd)
SYN: varicelliform.

Varicellovirus (var-e-sel′o-vi′rus)
SYN: varicella-zoster virus.

varices (var′i-sez)
Plural of varix.

variciform (var′i-si-form, va-ris′i-form)
Resembling a varix. SYN: cirsoid, varicoid.

varico-
A varix, varicose, varicosity. [L. varix, a dilated vein]

varicoblepharon (var′i-ko-blef′a-ron)
A varicosity of the eyelid. [varico- + G. blepharon, eyelid]

varicocele (var′i-ko-sel)
A condition manifested by abnormal dilation of the veins of the spermatic cord, caused by incompetent valves in the internal spermatic vein and resulting in impaired drainage of blood into the spermatic cord veins when the patient assumes the upright position. SYN: pampinocele. [varico- + G. kele, tumor, hernia] ovarian v. a varicose condition of the pampiniform plexus in the broad ligament of the uterus. SYN: tubo-ovarian v., utero-ovarian v.. symptomatic v. a v. caused by obstruction of the internal spermatic vein, usually at the level of the renal vein and usually due to invasive renal cell carcinoma, characterized by failure of the dilated veins in the spermatic cord to empty when the patient assumes a recumbent position. tubo-ovarian v. SYN: ovarian v.. utero-ovarian v. SYN: ovarian v..

varicocelectomy (var′i-ko-se-lek′to-me)
Operation for the correction of a varicocele by ligature and excision and by ligation alone of the dilated veins. [varicocele + G. ektome, excision]

varicography (var′i-kog′ra-fe)
Radiography of the veins after injection of contrast medium into varicose veins. [varico- + G. grapho, to write]

varicoid (var′i-koyd)
SYN: variciform.

varicomphalus (var-i-kom′fa-lus)
A swelling formed by varicose veins at the umbilicus. [varico- + G. omphalos, navel]

varicophlebitis (var′i-ko-fle-bi′tis)
Inflammation of varicose veins. [varico- + G. phleps, vein, + -itis, inflammation]

varicose (var′i-kos)
Relating to, affected with, or characterized by varices or varicosis.

varicosis, pl .varicoses (var-i-ko′sis, -sez)
A dilated or varicose state of a vein or veins. [varico- + G. -osis, condition]

varicosity (var-i-kos′i-te)
A varix or varicose condition.

varicotomy (var-i-kot′o-me)
An operation for varicose veins by subcutaneous incision. [varico- + G. tome, a cutting]

varicula (va-rik′u-la)
A varicose condition of the veins of the conjunctiva. SYN: conjunctival varix. [L. dim. of varix]

varicule (var′i-kul)
A small varicose vein ordinarily seen in the skin; may be associated with venous stars, venous lakes, or larger varicose veins. [L. varicula, dim. of varix]

variegation (ver′e-a-ga′shun)
The diversification or alteration of a phenotype produced by a change in the genotype during somatic development.

variola (va-ri′o-la)
SYN: smallpox. [Med. L. dim of L. varius, spotted] v. benigna SYN: varioloid (2) . v. hemorrhagica SYN: hemorrhagic smallpox. v. major SYN: smallpox. v. maligna malignant smallpox, usually of the hemorrhagic form. SYN: malignant smallpox. v. miliaris a form of varioloid in which the eruption consists of miliary vesicles without the formation of pustules. v. minor SYN: alastrim. v. pemphigosa a form of smallpox in which the eruption consists of pemphigus-like blebs. v. sine eruptione an abortive form of smallpox in which the disease subsides without the appearance of any eruption, or at most a few papules that never go on to pustulation. v. vaccine, v. vaccinia SYN: vaccinia. v. vera smallpox of ordinary severity in the unvaccinated. v. verrucosa a mild or abortive form of varioloid, the eruption of which consists mainly of papules, with occasionally minute vesicles at the apices, which persist for a time as wartlike lesions. SYN: wartpox.

variolar (va-ri′o-lar)
Relating to smallpox. SYN: variolic, variolous.

variolate (var′e-o-lat)
1. To inoculate with smallpox. 2. Pitted or scarred, as if by smallpox.

variolation (var′e-o-la′shun)
The obsolete process of inoculating a susceptible person with material from a vesicle of a patient with smallpox. SYN: variolization.

variolic (var-e-ol′ik)
SYN: variolar.

varioliform (va-ri′o-li-form, var-e-o′li-form)
SYN: varioloid (1) . [variola + L. forma, form]

variolization (var′e-o-li-za′shun)
SYN: variolation.

varioloid (var′e-o-loyd)
1. Resembling smallpox. SYN: varioliform. 2. A mild form of smallpox occurring in persons who are relatively resistant, usually as a result of a previous vaccination. SYN: modified smallpox, varicelloid smallpox, variola benigna. [variola + G. eidos, resemblance]

variolous (va-ri′o-lus)
SYN: variolar.

variolovaccine (va-ri′o-lo-vak′sen)
A vaccine obtained from the eruption following inoculation of a heifer with smallpox from the human.

varix, pl .varices (var′iks, var′i-sez)
1. A dilated vein. 2. An enlarged and tortuous vein, artery, or lymphatic vessel. [L. v. (varic-), a dilated vein] v. anastomoticus SYN: aneurysmal v.. aneurysmal v. dilation and tortuosity of a vein resulting from an acquired communication with an adjacent artery. SYN: Pott aneurysm, v. anastomoticus. cirsoid v. SYN: cirsoid aneurysm. conjunctival v. SYN: varicula. esophageal varices longitudinal venous varices at the lower end of the esophagus as a result of portal hypertension; they are superficial and liable to ulceration and massive bleeding. gelatinous v. a lumpy or nodular condition of the umbilical cord. lymph v. the formation of varices or cysts in the lymph nodes in consequence of obstruction in the efferent lymphatics. turbinal v. a condition of permanent dilation of the veins of the turbinated bodies, especially of the inferior turbinate.

varnish (dental)
Solutions of natural resins and gums in a suitable solvent, of which a thin coating is applied over the surfaces of the cavity preparations before placement of restorations, used as a protective agent for the tooth against constituents of restorative materials. SYN: cavity liner, vernix.

Varolius, Varolio
Constantius (Costanzio), Italian anatomist and physician, 1543–1575. See ileal sphincter, valve of V., pons varolii.

varus (va′rus)
Bent or twisted inward toward the midline of the limb or body; modern accepted usage, particularly in orthopedics, erroneously transposes the meaning of valgus to v., as in genu varum (bow-leg). [Mod. L. bent inward, fr. L. knock-kneed]

vas, gen. vasis, pl .vasa, gen. and pl. vasorum (vas, va′sis, va′sa, va-so′rum) [TA]
A duct or canal conveying any liquid, such as blood, lymph, chyle, or semen. SEE ALSO: vessel. [L. a vessel, dish] v. aberrans hepatis, pl .vasa aberrantia hepatis blind and/or atrophic bile duct remnants in the fibrous appendix and in the capsule of the liver at the margins of the left lobe and the groove for the inferior vena cava. v. aberrans of Roth an occasional diverticulum of the rete testis or of the efferent ductules of the testis. vasa aberrantia SYN: aberrant ductules, under ductule. v. afferens, pl .vasa afferentia SYN: afferent glomerular arteriole. v. anastomoticum [TA] SYN: anastomotic vessel. vasa brevia SYN: short gastric arteries, under artery. v. capillare [TA] SYN: capillary (2) . See blood capillary, lymph capillary. vasa chylifera chyle vessels. See lacteal (2) . v. collaterale SYN: collateral vessel. v. deferens, pl .vasa deferentia SYN: ductus deferens. v. efferens, pl .vasa efferentia 1. a vein carrying blood away from a part; SYN: efferent lymphatic, v. lymphaticum efferens. 2. SYN: efferent glomerular arteriole. 3. SYN: efferent ductules of testis, under ductule. Ferrein vasa aberrantia biliary canaliculi that are not connected with hepatic lobules. Haller v. aberrans SYN: inferior aberrant ductule. vasa lymphatica SYN: lymph vessels, under vessel. v. lymphaticum SYN: lymphatic (3) . v. lymphaticum afferens SYN: afferent lymphatic. v. lymphaticum efferens SYN: v. efferens (1) . v. lymphaticum profundum [TA] SYN: deep lymph vessel. v. lymphaticum superficiale [TA] SYN: superficial lymph vessel. vasa nervorum blood vessels supplying nerves. vasa previa umbilical vessels presenting in advance of the fetal head, usually traversing the membranes and crossing the internal cervical os. v. prominens ductus cochlearis a blood vessel in the substance of the spiral prominence of the cochler duct. vasa recta straight vessels into which the efferent arteriole of the juxtamedullary glomeruli breaks up; they form a leash of vessels which, arising at the bases of the pyramids, run through the renal medulla toward the apex of each pyramid, then reverse direction in a hairpin turn, and run straight back again toward the base of the pyramid as venae rectae; vasa recta renis [TA] arteries penetrating and supplying the renal medulla (pyramids). SYN: arteriolae rectae [TA] , straight arteries&star. vasa sanguinea auris internae [TA] SYN: vessels of internal ear, under vessel. vasa sanguinea choroideae [TA] SYN: choroid blood vessels, under blood vessel. vasa sanguinea intrapulmonalia [TA] SYN: intrapulmonary blood vessels, under blood vessel. vasa sanguinea retinae [TA] SYN: retinal blood vessels, under blood vessel. v. sanguineum [TA] SYN: blood vessel. v. spirale a blood vessel, larger than its fellows, running in the tympanic layer of the basilar membrane just beneath the tunnel of Corti. vasa vasorum [TA] small arteries distributed to the outer and middle coats of the larger blood vessels, and their corresponding veins. SYN: vessels of vessels. vasa vorticosa SYN: vorticose veins, under vein.

vas-
A vas, blood vessel. SEE ALSO: vasculo-, vaso-. [L. vas]

vasa (va′sa)
Plural of vas.

vasal (va′sal)
Relating to a vas or to vasa.

vascular (vas′ku-lar)
Relating to or containing blood vessels. [L. vasculum, a small vessel, dim. of vas]

vascularity (vas-ku-lar′i-te)
The condition of being vascular.

vascularization (vas′ku-lar-i-za′shun)
The formation of new blood vessels in a part. SYN: arterialization (3) .

vascularized (vas-ku-lar-izd)
Rendered vascular by the formation of new vessels.

vasculature (vas′ku-la-choor)
The vascular network of an organ.

vasculitis (vas-ku-li′tis)
SYN: angiitis. cutaneous v. an acute form of v. that may affect the skin only, but also may involve other organs, with a polymorphonuclear infiltrate in the walls of and surrounding small (dermal) vessels. Nuclear fragments are formed by karyorrhexis of the neutrophils. SEE ALSO: leukocytoclastic v.. SYN: hypersensitivity v.. hypersensitivity v. SYN: cutaneous v.. hypocomplementemic v. SYN: urticarial v.. leukocytoclastic v. cutaneous acute v. characterized clinically by palpable purpura, especially of the legs, and histologically by exudation of the neutrophils and sometimes fibrin around dermal venules, with nuclear dust and extravasation of red cells; may be limited to the skin or involve other tissues as in Henoch-Schönlein purpura. SEE ALSO: cutaneous v.. [G. leukos, white, + kytos, cell, + klastos, broken, fr. klao, to break] livedo v. hyaline degeneration of the walls of small dermal blood vessels with thrombolic occlusion seen with cryoglobulinemia or in atrophie blanche. No necrosis is seen. nodular v. chronic or recurrent nodular lesions of subcutaneous tissue, especially of the legs of older women, with lobular panniculitis, granulomatous inflammation with multinucleated giant cells, focal necrosis, and obliterative inflammation of the small blood vessels, resembling erythema induratum but without evidence of associated tuberculosis. urticarial v. painful, purpuric cutaneous lesions resembling urticaria but lasting more than 24 hours, with biopsy findings of leukocytoclastic v. and variable systemic changes, often with hypocomplementemia. SYN: hypocomplementemic v..

vasculo-
A blood vessel. SEE ALSO: vas-, vaso-. [L. vasculum, a small vessel, dim. of vas]

vasculocardiac (vas′ku-lo-kar′de-ak)
SYN: cardiovascular.

vasculogenesis (vas′ku-lo-jen′e-sis)
Formation of the vascular system. [vasculo- + G. genesis, production]

vasculomotor (vas′koo-lo-mo′ter)
SYN: vasomotor.

vasculomyelinopathy (vas′ku-lo-mi-e-li-nop′a-the)
Small cerebral vessel vasculopathy with subsequent perivascular demyelination, presumably due to circulating immune complexes.

vasculopathy (vas-ku-lop′a-the)
Any disease of the blood vessels. [vasculo- + G. pathos, disease]

vasculum, pl .vascula (vas′ku-lum, -la)
A small vessel. [L. dim of vas, a vessel]

vasectomy (va-sek′to-me)
Excision of a segment of the vas deferens, performed in association with prostatectomy, or to produce sterility. [vas- + G. ektome, excision]

vasifaction (vas-i-fak′shun)
SYN: angiopoiesis.

vasifactive (vas-i-fak′tiv)
SYN: angiopoietic.

vasiform (vas′i-form)
Having the shape of a vas or tubular structure.

vasitis (va-si′tis)
SYN: deferentitis. v. nodosa (va-si′tis no-do′sa) an inflammatory condition of the vas deferens characterized by the presence of numerous epithelium-lined spaces with the muscularis and adventitia, often containing spermatozoa; usually seen after vasectomy, and may clinically and microscopically mimic adenocarcinoma. SEE ALSO: vas deferens.

vaso-
Vas, blood vessel. SEE ALSO: vas-, vasculo-. [L. vas, a vessel]

vasoactive (va-so-ak′tiv, vas-o-)
Influencing the tone and caliber of blood vessels.

vasoconstriction (va′so-kon-strik′shun, vas′o-)
Narrowing of the blood vessels. active v. reduced caliber of a vessel caused by increased tonus in the smooth muscle in its walls. passive v. reduced caliber of a vessel caused by decreased intraluminal pressure.




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