D factor
| sheep | 1. <zoology> Any one of several species of ruminants of the genus Ovis, native of the higher mountains of both hemispheres, but most numerous in Asia. The domestic sheep (Ovis aries) varies much in size, in the length and texture of its wool, the form and size of its horns, the length of its tail, etc. It was domesticated in prehistoric ages, and many distinct breeds have been produced; as the merinos, celebrated for their fine wool; the Cretan sheep, noted for their long horns; the fat-tailed, or Turkish, sheep, remarkable for the size and fatness of the tail, which often has to be supported on trucks; the Southdowns, in which the horns are lacking; and an Asiatic breed which always has four horns. 2. A weak, bashful, silly fellow. 3. <zoology> Rocky mountain sheep. 4. <zoology> A shepherd dog, or collie. <botany> Sheep laurel See Argali, Mouflon, and Oorial. Origin: OE. Shep, scheep, AS. Scp, sceap; akin to OFries. Skp, LG. & D. Schaap, G. Schaf, OHG. Scaf, Skr. Chaga. Cf. Sheepherd. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| sheep bots | Oestrus ovis larvae. (05 Mar 2000) |
| sheep diseases | Diseases of domestic and mountain sheep of the genus ovis. (12 Dec 1998) |
| sheep-pox | A highly contagious disease of sheep, chiefly in parts of Asia, Africa, the Middle East, and southern Europe, caused by the sheep-pox virus, a member of the family Poxviridae. Synonym: ovinia. (05 Mar 2000) |
| sheep-pox virus | A poxvirus of the genus Capripoxvirus causing sheep-pox. (05 Mar 2000) |
| nairobi sheep disease | An arbovirus infection of sheep and goats transmitted by ticks. It is characterised by high fever and haemorrhagic gastroenteritis. (12 Dec 1998) |
| Nairobi sheep disease virus | An unclassified arbovirus of the family Bunyaviridae causing Nairobi sheep disease, transmitted by the tick, Rhipicephalus appendiculatus; it is a serologic group of virus's morphologically like Bunyavirus but antigenically unrelated to it. (05 Mar 2000) |
| nairobi sheep disease viruses | A group of viruses of the genus nairovirus, transmitted by the ixodid ticks and producing a lethal gastroenteritis in sheep and goats, especially in africa. Though major veterinary pathogens, their effect on humans has not been firmly established. (12 Dec 1998) |
| infectious necrotic hepatitis of sheep | A disease of sheep caused by the bacterium Clostridium novyi, which invades livers damaged by the fluke Fasciola hepatica and causes severe necrosis and death; this disease occurs in nearly all parts of the world, including the U.S. Sometimes called black disease because of the extensive haemorrhages seen on the inner surface of the pelt when it is removed. Synonym: black disease. (05 Mar 2000) |
| Kisenyi sheep disease virus | A virus, in the family Bunyaviridae, that is probably the same as Nairobi sheep disease virus. (05 Mar 2000) |
| abstracting and indexing | Shortening or summarizing of documents; assigning of descriptors for referencing documents. (12 Dec 1998) |
| academies and institutes | Organizations representing specialised fields which are accepted as authoritative; may be non-governmental, university or an independent research organization, e.g., national academy of sciences, brookings institution, etc. (12 Dec 1998) |
| accounts payable and receivable | Short-term debt obligations and assets occurring in the regular course of operational transactions. (12 Dec 1998) |
| aged, 80 and over | A person 80 years of age and older. (12 Dec 1998) |
| algae and fungi | Algae represent a group of spore-propagating plants, unicellular or undifferentiated into root, stem, and leaf. They include seaweed and many unicellular fresh water plants, most of which contain chlorophyll. They account for about 90% of the earth's photosynthetic activity. Fungi are eukaryotic, heterotrophic organisms that live as saprobes or parasites and include mushrooms, yeasts, smuts, molds, etc. They lack chlorophyll. (12 Dec 1998) |