| V | 1. <abbreviation> Vision or visual acuity; volt; with subscript 1, 2, 3, etc., the <abbreviation> Unipolar electrocardiogram leads. 2. Symbol for vanadium; valine; volume, frequently with subscripts denoting location, chemical species, and/or conditions. 3. Symbol for gas flow, frequently with subscripts indicating location and chemical species. See: flow. 4. Symbol for ventilation, frequently with a subscript. See entries under ventilation. Origin: volume + overdot denoting time derivative (05 Mar 2000) |
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| V antigen | Viral antigen that is intimately associated with the virus particle, is protein in nature, has multiple antigenicities, and is strain-specific; antibody to such antigen is demonstrable as protective or neutralizing antibody. (05 Mar 2000) |
| V gene | v region |
| V lead | A unipolar lead with the central terminal as the indifferent electrode; V is the symbol for unipolar (Latin "U"). (05 Mar 2000) |
| v moth | <zoology> A common gray European moth (Halia vauaria) having a V-shaped spot of dark brown on each of the fore wings. Source: Websters Dictionary (01 Mar 1998) |
| v onc | <molecular biology> General abbreviation for the viral form of an oncogene, c.f. C onc, the normal, cellular proto-oncogene. (18 Nov 1997) |
| V region | <molecular biology> Those regions in the amino acid sequence of both the heavy and the light chains of immunoglobulins where there is considerable sequence variability from one immunoglobulin to other of the same class, in contrast to constant sequence (C) regions. The V regions are associated with the antigen binding areas. They contain hypervariable regions of particularly high sequence diversity. (18 Nov 1997) |
| v sign of naclerio | <radiology> V-shaped collection of air, in mediastinum and along diaphragm, indicates pneumomediastinum and pneumothorax, seen in Boerhaave syndrome (12 Dec 1998) |
| V wave | <cardiology, physiology> A large pressure wave visible in recordings from either atrium or its incoming veins, normally produced by venous return but becoming very large when blood regurgitates through the A-V valve beyond the chamber from which the recording is made. (05 Mar 2000) |
| V-2 carcinoma | <tumour> A transplantable, highly malignant carcinoma of experimental animals that developed as a result of malignant change in a virus-induced papilloma of a domestic rabbit. (05 Mar 2000) |
| V-A | <abbreviation> Ventriculoatrial. (05 Mar 2000) |
| V-bends | V-shaped bends incorporated in an archwire, usually placed mesially or distally to the canines (cuspids) and used as a "dead" area of wire through which torquing bends may be placed. (05 Mar 2000) |
| V-esotropia | Convergent strabismus greater in downward than in upward gaze. (05 Mar 2000) |
| V-exotropia | Divergent strabismus greater in upward than in downward gaze. (05 Mar 2000) |
| V-MI | <abbreviation> Volpe-Manhold Index. (05 Mar 2000) |