| Acarus gallinae | The red hen-mite, a parasite of chickens, pigeons, and other birds; it sometimes attacks humans and causes an itching eruption, especially in sensitised individuals. Synonym: Acarus gallinae. Origin: derm-+ G. Nysso, to prick; L. Gallina, hen (05 Mar 2000) |
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| Acarus hordei | The barley mite, a species that penetrates beneath the skin. (05 Mar 2000) |
| Acarus rhizoglypticus hyacinthi | A species that develops in spoiled onions and may cause dermatitis. (05 Mar 2000) |
| Acarus scabiei | A former term for Sarcoptes scabiei. (05 Mar 2000) |
| acaryote | A cell without a nucleus (karyon), such as the erythrocyte. Synonym: acaryote, akaryote. Origin: G. A-priv. + karyon, kernel, + kytos, a hollow (cell) (05 Mar 2000) |