| von Spee's curve | The anatomic curvature of the mandibular occlusal plane beginning at the tip of the lower cuspid and following the buccal cusps of the posterior teeth, continuing to the terminal molar. Synonym: von Spee's curve. (05 Mar 2000) |
|---|---|
| Von Willebrand disease | <disease, haematology> A hereditary platelet disorder caused by defective or deficient Von Willebrand factor, a protein involved in normal blood clotting, that reduces adhesion to collagen but not aggregation. Both bleeding time and coagulation are increased. Factor VIII levels are secondarily reduced. Symptoms include nosebleeds, bleeding gums, heavy menstrual bleeding, bruising and skin rashes. Inheritance: autosomal dominant. (30 Sep 1997) |
| Von Willebrand factor | Plasma factor involved in platelet adhesion through an interaction with Factor VIII. See: Von Willebrand disease. (18 Nov 1997) |
| von Willebrand factor-degrading protease | <enzyme> A large protease from normal human plasma that degrades vwf at the 842tyr-843met peptide bond Registry number: EC 3.4.24.- Synonym: vwf-cleaving protease (26 Jun 1999) |
| Von Willebrand's disease | <disease> This congenital disease, which is caused a deficiency of a blood factor that promotes platelet adhesion, is characterised by prolonged bleeding and poor blood coagulation. (09 Oct 1997) |
| von Willebrand, E | <person> Finnish physician, 1870-1949. See: von Willebrand's disease. (05 Mar 2000) |
| vondsira | <zoology> Same as Vansire. Source: Websters Dictionary (01 Mar 1998) |
| Voorhoeve's disease | Linear striations seen radiographically in the metaphyses of long bones and also flat bones; it may be a variant of osteopoikilosis. Synonym: Voorhoeve's disease. (05 Mar 2000) |
| Voorhoeve, N | <person> Dutch radiologist, 1879-1927. See: Voorhoeve's disease. (05 Mar 2000) |
| vortex | Origin: L. Vortex, vertex, -icis, fr. Vortere, vertere, to turn. See Vertex. 1. A mass of fluid, especially of a liquid, having a whirling or circular motion tending to form a cavity or vacuum in the center of the circle, and to draw in towards the center bodies subject to its action; the form assumed by a fluid in such motion; a whirlpool; an eddy. 2. A supposed collection of particles of very subtile matter, endowed with a rapid rotary motion around an axis which was also the axis of a sun or a planet. Descartes attempted to account for the formation of the universe, and the movements of the bodies composing it, by a theory of vortices. 3. <zoology> Any one of numerous species of small Turbellaria belonging to Vortex and allied genera. <chemistry> Vortex atom, a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structure of the chemical atom. Vortex wheel, a kind of turbine. Source: Websters Dictionary (01 Mar 1998) |
| vortex coccygeus | A spiral arrangement of coarse hairs sometimes present over the region of the coccyx. Synonym: coccygeal whorl. (05 Mar 2000) |
| vortex cordis | A spiral arrangement of muscular fibres at the apex of the heart. Synonym: vortex cordis, whorl. (05 Mar 2000) |
| vortex lentis | One of the stellar figures on the surface of the lens of the eye. Synonym: vortex. (05 Mar 2000) |
| vortex of heart | A spiral arrangement of muscular fibres at the apex of the heart. Synonym: vortex cordis, whorl. (05 Mar 2000) |
| vortex veins | Several veins (usually four) from the vascular tunic formed of veins accompanying the posterior ciliary arteries and the ciliary body; then drain into the superior or inferior ophthalmic vein. Synonym: venae vorticosae, venae choroideae oculi, choroid veins of eye, Stensen's veins, vasa vorticosa, vorticose veins. (05 Mar 2000) |