| vernal encephalitis | 1. (Central European subtype) tick-borne meningoencephalitis caused by a flavivirus closely related to the virus causing the Far Eastern type; it is transmitted by Ixodes ricinus, also by infected raw milk, especially that of goats. Synonym: biundulant meningoencephalitis, Central European tick-borne fever, diphasic milk fever, Russian spring-summer encephalitis (Western subtype). 2. (Eastern subtype) tick-borne encephalitis, a severe form of encephalitis caused by a flavivirus, a virus belonging to the Flaviviridae family, and transmitted by ticks (Ixodes pertulcatus and I. Ricinus). Synonym: Russian tick-borne encephalitis. (05 Mar 2000) |
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| vernal keratoconjunctivitis | A chronic, bilateral conjunctival inflammation with photophobia and intense itching that recurs seasonally during warm weather; characterised in the palpebral form by cobblestone papillae in the upper palpebral conjunctiva and in the bulbar form by gelatinous nodules adjacent to the corneoscleral limbus. Synonym: allergic conjunctivitis, spring conjunctivitis, spring ophthalmia, vernal catarrh, vernal keratoconjunctivitis. (05 Mar 2000) |
| vernal pools | <ecology> Perched wetlands which are seasonally to semi-permanently flooded depressions typically occurring on sites with poor drainage. (09 Oct 1997) |
| vernation | <plant biology> The arrangement of unexpanded leaves in a bud. Compare: aestivation. (09 Oct 1997) |
| Verner, John | <person> U.S. Internist, *1927. See: Verner-Morrison syndrome. (05 Mar 2000) |
| verner-morrison syndrome | <radiology> WDHA syndrome, watery diarrhoea, hypokalaemia, achlorhydria, vasoactive intestinal peptide (VIP) secreted by, pancreatic isleT-cell tumour (VIPoma) (12 Dec 1998) |
| Vernet's syndrome | <syndrome> A syndrome characterised by paralysis of the motor components of the glossopharyngeal, vagus, and accessory cranial nerves as they lie in the posterior fossa; it is most commonly the result of head injury. (05 Mar 2000) |
| Vernet, Maurice | <person> French neurologist, *1887. See: Vernet's syndrome. (05 Mar 2000) |
| Verneuil, Aristide | <person> French surgeon, 1823-1895. See: Verneuil's neuroma, hidradenitis axillaris of Verneuil. (05 Mar 2000) |
| vernicose | <botany> Having a brilliantly polished surface, as some leaves. See: Varnish. Source: Websters Dictionary (01 Mar 1998) |
| vernier | A short scale made to slide along the divisions of a graduated instrument, as the limb of a sextant, or the scale of a barometer, for indicating parts of divisions. It is so graduated that a certain convenient number of its divisions are just equal to a certain number, either one less or one more, of the divisions of the instrument, so that parts of a division are determined by observing what line on the vernier coincides with a line on the instrument. Vernier calipers, Vernier gauge, a gauge with a graduated bar and a sliding jaw bearing a vernier, used for accurate measurements. Vernier compass, a surveyor's compass with a vernier for the accurate adjustment of the zero point in accordance with magnetic variation. Vernier transit, a surveyor's transit instrument with a vernier compass. Origin: So named after the inventor, Pierre Vernier. Source: Websters Dictionary (01 Mar 1998) |
| Vernier acuity | The detection of displacement of a portion of a line. (05 Mar 2000) |
| Vernier, Pierre | <person> French mathematician, 1580-1637. See: Vernier acuity. (05 Mar 2000) |
| vernine | <chemistry> An alkaloid extracted from the shoots of the vetch, red clover, etc, as a white crystalline substance. Origin: Vernal + -ine. Source: Websters Dictionary (01 Mar 1998) |
| vernix | varnish (dental) |