| achillotomy | Division of the tendo calcaneus. Synonym: achillotenotomy. Origin: Achilles (tendon) + G. Tome, incision (05 Mar 2000) |
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| achilous | <botany> Without a lip. Origin: Gr. Priv. + lip. Source: Websters Dictionary (01 Mar 1998) |
| aching | That aches; continuously painful. See Ache. Ach"ingly, "The aching heart, the aching head." (Longfellow) Source: Websters Dictionary (01 Mar 1998) |
| achiote | Seeds of the annotto tree; also, the colouring matter, annotto. Origin: Sp. Achiote, fr. Indian achiotl. Source: Websters Dictionary (01 Mar 1998) |
| achiral | <chemistry> A term used to describe a molecule which, in a given configuration, is superimposible on its mirror image. This is in contrast to chiral molecules which cannot be superimposed on their mirror images. (13 Nov 1997) |
| achiropody | Congenital absence of the hands and feet; autosomal recessive inheritance. Origin: G. A-priv. + cheir, hand, + podos, foot (05 Mar 2000) |
| achlamydate | <zoology> Not possessing a mantle; said of certain gastropods. Origin: Gr. Priv. + . A short cloak. Source: Websters Dictionary (01 Mar 1998) |
| achlamydeous | <botany> Naked; having no floral envelope, neither calyx nor corolla. Source: Websters Dictionary (01 Mar 1998) |
| achlorhydria | <gastroenterology> The absence of hydrochloric acid from the gastric juice. (27 Sep 1997) |
| achlorhydric anaemia | A form of chronic hypochromic microcytic anaemia associated with achlorhydria or achylia gastrica; observed most frequently in women in the third to fifth decades. Synonym: Faber's anaemia, Faber's syndrome. (05 Mar 2000) |
| achlorophyllous | Without chlorophyll, as in fungi. (05 Mar 2000) |
| acholeplasma | A genus of gram-negative organisms including saprophytic and parasitic or pathogenic species. (12 Dec 1998) |
| Acholeplasma axanthum | A species originally found in a murine leukaemia cell line; ecology not determined. (05 Mar 2000) |
| Acholeplasma granularum | A species that occurs as a commensal in swine; pathogenicity not determined. (05 Mar 2000) |
| acholeplasma laidlawii | An organism originally isolated from sewage, manure, humus, and soil, but recently found as a parasite in mammals and birds. (12 Dec 1998) |