| apiculus | A short, sharp projection on one end of a fungus spore at the point of attachment, or on the wall, of a hypha or condiophore. Origin: L. (05 Mar 2000) |
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| apicurettage | Apical curettage after removal of an infected tooth. (05 Mar 2000) |
| apidaecins | <protein> Proline rich basic antibacterial peptides (2 kD) found in the immune haemolymph of the honeybee. (18 Nov 1997) |
| apiin synthetase | <enzyme> Transfers d-apiose from udpapiose to 4',5-dihydroxyflavon-7-yl beta-d-glucopyranoside Registry number: EC 2.4.2.- (26 Jun 1999) |
| apinealism | Acquired absence of the pineal gland. (05 Mar 2000) |
| apiol | <medicine> An oily liquid derived from parsley. Origin: L. Apium parsley + -ol. Source: Websters Dictionary (01 Mar 1998) |
| apiphobia | <psychology> Morbid fear of bees. Synonym: melissophobia. Origin: L. Apis, bee, + G. Phobos, fear (05 Mar 2000) |
| apis | <zoology> A genus of insects of the order Hymenoptera, including the common honeybee (Apis mellifica) and other related species. See Honeybee. Origin: L, bee. Source: Websters Dictionary (01 Mar 1998) |
| apituitarism | Total lack of functional pituitary tissue; may be iatrogenic (e.g., as a consequence of hypophysectomy) or the result of a spontaneous disease process. (05 Mar 2000) |
| aplacental | Without a placenta; denoting the monotremes (which lay eggs and have no placenta) and the marsupials (which have a transitory simple yolk-sac placenta). (05 Mar 2000) |
| aplacentata | <zoology> Mammals which have no placenta. Origin: Pref. A- not + placenta. Source: Websters Dictionary (01 Mar 1998) |
| aplacophora | <zoology> A division of Amphineura in which the body is naked or covered with slender spines or setae, but is without shelly plates. Origin: NL, fr. Gr. Priv. + a flat cake + to bear. Source: Websters Dictionary (01 Mar 1998) |
| aplanatic | <microscopy> Corrected for spherical aberration and coma. (05 Aug 1998) |
| aplanatic lens | A lens designed to correct spherical aberration and coma (q.v.). Synonym: periscopic meniscus. (05 Mar 2000) |
| aplanatic points | <microscopy> The two conjugate points for which a completely spherical glass lens is aplanatic. They lie on the principal axis, both within the sphere. (05 Aug 1998) |