| aphthous ulcer | <gastroenterology> A type of benign mouth ulcer often caused by injury to the mucosal lining of the oral cavity, viral infection or vitamin deficiency. (27 Sep 1997) |
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| aphthovirus | <virology> A genus of the family picornaviridae causing foot-and-mouth disease in cloven-hoofed animals. (12 Dec 1998) |
| aphylactic | Rarely used term for pertaining to or characterised by aphylaxis. (05 Mar 2000) |
| aphylaxis | Rarely used term for lack of protection against disease. Synonym: nonimmunity. Origin: G. A-priv. + phylaxis, a guarding (05 Mar 2000) |
| aphyllous | <botany> Destitute of leaves, as the broom rape, certain euphorbiaceous plants, etc. Origin: Gr.; priv. + leaf. Source: Websters Dictionary (01 Mar 1998) |