| veliger | <zoology> Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming. Origin: NL, fr. L. Velum a veil + gerere bear. Source: Websters Dictionary (01 Mar 1998) |
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| vell | The salted stomach of a calf, used in making cheese; a rennet bag. Origin: Cf. L. Vellus the skin of a sheep with the wool on it, a fleece, a hide or pelt, or E. Fell a hide. Source: Websters Dictionary (01 Mar 1998) |
| Vella's fistula | Experimental isolation of a segment of intestine in a dog or other animal; the mesenteric attachment is preserved, the divided intestine at each end of the segment is joined by anastomosis, and the ends of the segment are stitched to openings in the abdominal wall. Synonym: Vella's fistula. (05 Mar 2000) |
| Vella, Luigi | <person> Italian physiologist, 1825-1886. See: Vella's fistula, Thiry-Vella fistula. (05 Mar 2000) |
| vellicate | To twitch or contract spasmodically; said especially of fibrillary muscular spasms. Origin: L. Vellico, pp. -atus, to pluck, to twitch, fr. Vello, to deprive of hair, pluck (05 Mar 2000) |
| vellication | 1. The act of twitching, or of causing to twitch. 2. <medicine> A local twitching, or convulsive motion, of a muscular fibre, especially of the face. Origin: L. Vellicatio. Source: Websters Dictionary (01 Mar 1998) |
| vellus | 1. Fine nonpigmented hair covering most of the body. 2. A structure that is fleecy or soft and woolly in appearance. Origin: L. Fleece Vellus olivae inferioris, a stratum of nerve fibres surrounding the inferior olive. (05 Mar 2000) |
| vellus hair | Colourless, soft, fine postnatal to adult hair. (05 Mar 2000) |
| velo-cardio-facial syndrome | <syndrome> Also known as shprintzen syndrome, this more than is a congenital malformation (birth defect) syndrome with cleft palate, heart defect, abnormal face, and learning problems. The condition is therefore called the velo-cardio-facial (vcf) syndrome. (the velum is the soft palate). Other less frequent features include short stature, small-than-normal head (microcephaly), mental retardation, minor ear anomalies, slender hands and digits, and inguinal hernia. The cause is usually a microdeletion in chromosome band 22q11.2, just as in digeorge syndrome. Vcf and digeorge syndromes are different clinical expressions of essentially the same chromosome defect. Of essentially the same chromosome defect. (12 Dec 1998) |
| velocity | The time rate of motion, the distance traveled divided by the time required to travel that distance. (09 Oct 1997) |
| velocity coefficient | The rate of transformation of a unit mass of substance in a chemical reaction. (05 Mar 2000) |
| velocity constants | Proportionality constants equal to the initial rate of a reaction divided by the concentration of the reactant(s); e.g., in the reaction A → B + C, the rate of the reaction equals -d[A]/dt = k1[A]. The rate constant k1 is a unimolecular rate constant since there is only one molecular species reacting and has units of reciprocal time (e.g., sec-1). For the reverse reaction, B + C → A, the rate equals -d[B]/dt = d[A]/dt = k2[B][C]. The rate constant k2 is a bimolecular rate constant and has units of reciprocal concentration-time (e.g., m-1 sec-1). Synonym: velocity constants. (05 Mar 2000) |
| velocity space | <radiobiology> Mathematical space where each point corresponds not to a certain location in reality, but to a certain velocity. Distribution functions typically involve mixes of both position and velocity spaces. (See distribution function.) Contrast with position space where each point corresponds to a given location. (09 Oct 1997) |
| velocity space instability | <radiobiology> A class of instabilities driven by particle distributions (in velocity space) which are not in thermal equilibrium. (09 Oct 1997) |
| velogenic | Denoting the virulence of a virus capable of inducing, after a brief incubation period, a fulminating and often lethal disease in embryonic, immature, and adult hosts; used in characterizing Newcastle disease virus. Origin: L. Velox, rapid, + G. -gen, producing (05 Mar 2000) |
| velamentous |
(vel
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| velamentum |
(vel
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| velar |
(ve
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| vellus |
(vel
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| velopharyngeal |
(ve
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| vel | touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements |
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| vel | a sudden muscle spasm |
| vel | fine parchment prepared from the skin of a young animal e.g. a calf or lamb |
| vel | a heavy creamy-colored paper resembling parchment |
| vel | a cycle with three wheels |
| vel | any of several early bicycles with pedals on the front wheel |
| vel | small active carnivore that probably fed on protoceratops |
| vel | distance travelled per unit time |
| vel | heavy fabric that resembles velvet |
| vel | heavy fabric that resembles velvet |
| vel | white sauce made with stock instead of milk |
| vel | a muscular flap that closes off the nasopharynx during swallowing or speaking |