| vacuum casting | The casting of a metal in the presence of a vacuum. (05 Mar 2000) |
|---|---|
| vacuum curettage | Aspiration of the contents of the uterus with a vacuum curette. (12 Dec 1998) |
| vacuum desiccator | A desiccator that can be evacuated. (05 Mar 2000) |
| vacuum disk phenomenon | The appearance of a radiolucent stripe in an intervertebral disk, a manifestation of disk degeneration; a misnomer since there is gas present. (05 Mar 2000) |
| vacuum extraction, obstetrical | Removal of the foetus from the uterus or vagina at or near the end of pregnancy with a metal traction cup that is attached to the foetus' head. Negative pressure is applied and traction is made on a chain passed through the suction tube. (12 Dec 1998) |
| vacuum extractor | Device for producing traction upon the head of a foetus by means of a soft cup held by a vacuum. (05 Mar 2000) |
| vacuum flask | <apparatus> A glass vessel, often silvered, with two walls, the space between which is evacuated; used for maintaining materials at constant temperature or, more usually, at low temperature. Synonym: vacuum flask. (05 Mar 2000) |
| vacuum headache | Headache due to closure of the frontal sinus. (05 Mar 2000) |
| vacuum pan | A device for growing crystals from solutions by gradually lowering the pressure within the sealed container holding the liquid. (09 Oct 1997) |
| vacuum tube | A glass tube from which the air has been removed, containing two or more electrodes, between which passes an electrical current or spark; used in the production of X-rays, or to control circuits. Previously in wide use, the vacuum tube has been supplanted by transistors in electronic circuits. (05 Mar 2000) |
| vadantes | <ornithology> An extensive artificial group of birds including the wading, swimming, and cursorial birds. Origin: NL, from L. Vadans, p. Pr. Of vadare to wade, to ford. Source: Websters Dictionary (01 Mar 1998) |
| vadum | An occasional elevation from the bottom of a cerebral sulcus nearly obliterating it for a short distance. Origin: L. A ford (05 Mar 2000) |
| vagabond | One who wanders from place to place, having no fixed dwelling, or not abiding in it, and usually without the means of honest livelihood; a vagrant; a tramp; hence, a worthless person; a rascal. "A fugitive and a vagabond shalt thou be." (Gen. Iv. 12) In English and American law, vagabond is used in bad sense, denoting one who is without a home; a strolling, idle, worthless person. Vagabonds are described in old English statutes as "such as wake on the night and sleep on the day, and haunt customable taverns and alehouses, and routs about; and no man wot from whence they came, nor whither they go." In American law, the term vagrant is employed in the same sense. Cf Rogue. Source: Websters Dictionary (01 Mar 1998) |
| vagabond's disease | Excoriations and melanoderma caused by scratching the bites of the body louse, Pediculus corporis. Synonym: Greenhow's disease, vagabond's disease, vagrant's disease. Racial melanoderma, the normally dark skin of blacks and certain other races. Senile melanoderma, cutaneous pigmentation occurring in the aged. Synonym: melasma universale. (05 Mar 2000) |
| vagal | <anatomy> Pertaining to the vagus nerve. (18 Nov 1997) |