| avian neurolymphomatosis virus | The herpesvirus that causes avian lymphomatosis (Marek's disease); is distinct from those causing other forms of leukosis. Synonym: avian lymphomatosis virus, fowl neurolymphomatosis virus, Marek's disease virus. (05 Mar 2000) |
|---|---|
| avian pneumoencephalitis virus | <virology> A paramyxovirus that causes the fatal disease, fowl pest, in poultry. (18 Nov 1997) |
| avian reticuloendotheliosis | A leukosis-like disease of fowl caused by viruses of the avian type C retroviruses. (05 Mar 2000) |
| avian sarcoma | <tumour> A fibrosarcoma, originally observed in a Plymouth Rock hen, now thought to be an expression of infection by certain viruses of the avian leukosis-sarcoma complex in the family Retroviridae. Synonym: avian sarcoma, Rous tumour. (05 Mar 2000) |
| avian sarcoma virus | avian leukosis-sarcoma complex |
| avian trichomoniasis | Trichomoniasis occurring in the upper digestive tract in a variety of birds and caused by Trichomonas gallinae; it causes necrotic ulceration in the mouth, oesophagus, crop, and proventriculus, frequently with rapid weight loss and death. (05 Mar 2000) |
| avian viral arthritis virus | A virus of the genus Reovirus, family Reoviridae, causing tenosynovitis and arthritis in chickens. (05 Mar 2000) |
| aviation | Design, development, manufacture, and operation of heavier-than-air aircraft. (12 Dec 1998) |
| aviation medicine | The study and practice of medicine as it applies to physiologic problems peculiar to aviation. Synonym: aeromedicine. (05 Mar 2000) |
| aviation otitis | See Aerotitis. (12 Dec 1998) |
| aviator's disease | Syndrome resembling decompression sickness occurring in occupants of airplanes that reach very high altitudes without adequate pressurization of the cabin. See: decompression sickness. (05 Mar 2000) |
| aviator's ear | See Aerotitis. (12 Dec 1998) |
| avibirnavirus | A genus of RNA viruses in the family birnaviridae infecting birds. It is transmitted horizontally with no known vectors. The type species is infectious bursal disease virus. (12 Dec 1998) |
| avicula | <zoology> A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; so called from a supposed resemblance of the typical species to a bird. Origin: L, small bird. Source: Websters Dictionary (01 Mar 1998) |
| avicularia | <zoology> See prehensile processes on the cells of some Bryozoa, often having the shape of a bird's bill. Origin: NL. See Avicular. Source: Websters Dictionary (01 Mar 1998) |