| vacuum pan | A device for growing crystals from solutions by gradually lowering the pressure within the sealed container holding the liquid. (09 Oct 1997) |
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| 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) |
| vagal attack | <syndrome> Syndrome consisting of palpitation, chest pain, respiratory difficulties, and disturbances in gastric motility; once attributed to vagal stimulation, now considered psychogenic (anxiety neurosis). Synonym: vagal attack, vasovagal attack. (05 Mar 2000) |
| vagal bradycardia | Any excessive cardiac slowing due to stimulation of the vagus nerves. (05 Mar 2000) |
| vagal part | <anatomy, nerve> The roots of the accessory nerve which arise from the medulla; the nerve fibres of the cranial root join the intracranial portion of the vagus nerve and are distributed to the pharyngeal plexus, providing the motor innervation of the soft palate (except the tensor veli palati) and the pharynx. Synonym: pars vagalis nervi accessorii, radices craniales, accessory portion of spinal accessory nerve, cranial roots, vagal part of accessory nerve, vagal part. (05 Mar 2000) |
| vagal part of accessory nerve | <anatomy, nerve> The roots of the accessory nerve which arise from the medulla; the nerve fibres of the cranial root join the intracranial portion of the vagus nerve and are distributed to the pharyngeal plexus, providing the motor innervation of the soft palate (except the tensor veli palati) and the pharynx. Synonym: pars vagalis nervi accessorii, radices craniales, accessory portion of spinal accessory nerve, cranial roots, vagal part of accessory nerve, vagal part. (05 Mar 2000) |
| vagal trigone | A prominence in the floor of the inferior fovea of the fourth ventricle that overlies the dorsal motor nucleus of the vagus. Synonym: trigonum nervi vagi, ala cinerea, ashen wing, gray wing, trigone of vagus nerve, va'gi eminentia. (05 Mar 2000) |
| vagal trunk | One of the two nerve bundles, anterior and posterior, into which the oesophageal plexus continues as it passes through the diaphragm. Synonym: truncus vagalis. (05 Mar 2000) |
| vagantes | <zoology> A tribe of spiders, comprising some of those which take their prey in a web, but which also frequently run with agility, and chase and seize their prey. Origin: NL, fr. L. Vagans, p. Pr. Of vagari to stroll or wander. Source: Websters Dictionary (01 Mar 1998) |
| vagectomy | Surgical removal of a segment of a vagus nerve. (05 Mar 2000) |