| y-suppressed lethal gene | <genetics> In the fruit fly Drosophila, this is a recessive, lethal gene that kills XO flies but not normal XY male flies. (09 Oct 1997) |
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| yaba monkey tumour virus | The type species of yatapoxvirus, a tumour-producing DNA virus discovered in monkeys in yaba, nigeria. It has been found to produce histiocytomas in monkeys and humans. (12 Dec 1998) |
| Yaba monkey virus | A poxvirus from the family Poxviridae, distinct from monkeypox virus, that causes Yaba tumours in monkeys. Synonym: Yaba monkey virus. (05 Mar 2000) |
| Yaba tumour | <oncology, virology> A poxvirus-induced neoplasm of African monkeys caused by the Yaba monkey virus, a member of the family Poxviridae. It is associated with tumour-like growths occur chiefly on the head and limbs. The tumours are benign and the natural disease has been reported only in Africa in monkeys kept outdoors. (05 Mar 2000) |
| Yaba virus | A poxvirus from the family Poxviridae, distinct from monkeypox virus, that causes Yaba tumours in monkeys. Synonym: Yaba monkey virus. (05 Mar 2000) |
| YAC | <molecular biology> A vector system that allows extremely large segments of DNA to be cloned. Useful in chromosome mapping, contiguous yeast artificial chromosomes covering the whole Drosophila genome and certain human chromosomes are available. Acronym: YAC (15 Nov 1997) |
| yacare | <zoology> A South American crocodilian (Jacare sclerops) resembling the alligator in size and habits. The eye orbits are connected together, and surrounded by prominent bony ridges. Synonym: spectacled alligator, and spectacled cayman. Alternative forms: jacare. The name is also applied to allied species. See: Jacare. Source: Websters Dictionary (01 Mar 1998) |
| yacca | <botany> A West Indian name for two large timber trees (Podocarpus coriaceus, and P. Purdicanus) of the Yew family. The wood, which is much used, is pale brownish with darker streaks. Source: Websters Dictionary (01 Mar 1998) |
| yaffingale | <zoology> The yaffle. See: Yaffle, and cf. Nightingale. Source: Websters Dictionary (01 Mar 1998) |
| yaffle | <zoology> The European green woodpecker (Picus, or Genius, viridis). It is noted for its loud laughlike note. Called also eccle, hewhole, highhoe, laughing bird, popinjay, rain bird, yaffil, yaffler, yaffingale, yappingale, yackel, and woodhack. Origin: Probably imitative of its call or cry. Source: Websters Dictionary (01 Mar 1998) |
| yag laser surgery | <ophthalmology, procedure, surgery> The use of laser light to punch a hole in the iris to relieve intraocular pressure within the eye (for example glaucoma). This surgery is painless and requires no anaesthesia. (27 Sep 1997) |
| yaguarundi | <zoology> Same as Jaguarondi. Alternative forms: yaguarondi, and yagouarondi. Source: Websters Dictionary (01 Mar 1998) |
| yak | <zoology> A bovine mammal (Poephagus grunnies) native of the high plains of Central Asia. Its neck, the outer side of its legs, and its flanks, are covered with long, flowing, fine hair. Its tail is long and bushy, often white, and is valued as an ornament and for other purposes in India and China. There are several domesticated varieties, some of which lack the mane and the long hair on the flanks. Called also chauri gua, grunting cow, grunting ox, sarlac, sarlik, and sarluc. Yak lace, a coarse pillow lace made from the silky hair of the yak. Origin: Thibetan gyag. Source: Websters Dictionary (01 Mar 1998) |
| yakamilk | <zoology> See Trumpeter, 3. Source: Websters Dictionary (01 Mar 1998) |
| yakare | <zoology> Same as Yacare. Source: Websters Dictionary (01 Mar 1998) |