| acanthopterygii | <zoology> An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch. Origin: NL, from Gr. Thorn + fin, dim. Fr. Wing. Source: Websters Dictionary (01 Mar 1998) |
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| acanthopterygious | <zoology> Having fins in which the rays are hard and spinelike; spiny-finned. Source: Websters Dictionary (01 Mar 1998) |
| acanthor | The spindle-shaped embryo, with rostellar hooks and body spines, formed within the egg shell of Acanthocephala; this stage burrows into the body cavity of its first intermediate host, usually a crustacean in aquatic cycles, or insects in terrestrial cycles. Origin: G. Akantha, thorn or spine (05 Mar 2000) |
| acanthorrhexis | Rupture of the intercellular bridges of the prickle cell layer of the epidermis, as in contact-type dermatitis. See: spongiosis. Origin: acantho + G. Rhexis, rupture (05 Mar 2000) |
| acanthosis | An increase in the thickness of the stratum spinosum of the epidermis. Synonym: hyperacanthosis. Origin: acantho-+ G. -osis, condition (05 Mar 2000) |
| acanthosis nigricans | <radiology> Pre-malignant skin disorder, papillomatosis, pigmentation, hyperkeratosis, multiple filling defects in oesophagus, increased risk of carcinoma in stomach and abdomen (12 Dec 1998) |
| acanthotic | Pertaining to or characteristic of acanthosis. (05 Mar 2000) |
| acanthrocyte | An erythrocyte characterised by multiple spiny cytoplasmic projections, as in acanthocytosis. Synonym: acanthrocyte. Origin: acantho-+ G. Kytos, cell (05 Mar 2000) |
| acanthrocytosis | <haematology> A rare condition where the majority of red blood cells are acanthocytes (red blood cells with multiple spiny cytoplasmic projections), a feature of abetalipoproteinaemia. (27 Sep 1997) |
| acanthus | Origin: L, from Gr. Cf. Acantha. 1. <botany> A genus of herbaceous prickly plants, found in the south of Europe, Asia Minor, and India; bear's-breech. 2. An ornament resembling the foliage or leaves of the acanthus (Acanthus spinosus); used in the capitals of the Corinthian and Composite orders. Source: Websters Dictionary (01 Mar 1998) |
| acapnia | Less than the normal level of carbon dioxide in the blood. The opposite of hypercapnia. (12 Dec 1998) |
| acapnial alkalosis | The alkalosis resulting from abnormal loss of CO2 produced by hyperventilation, either active or passive, with concomitant reduction in arterial plasma bicarbonate concentration. See: compensated alkalosis. Synonym: acapnial alkalosis. (05 Mar 2000) |
| acapsular | <botany> Having no capsule. Origin: Pref. A- not + capsular. Source: Websters Dictionary (01 Mar 1998) |
| acarbia | An obsolete term denoting pronounced reduction in bicarbonate of the blood (hypocarbia). Origin: G. A-priv. + carbon (05 Mar 2000) |
| acarbose 7-phosphotransferase | <enzyme> Catalyses reaction between ATP and acarbose to form acarbose 7-phosphate; isolated from actinoplanes; n-terminal amino acid sequence given in first source Registry number: EC 2.7.1.- Synonym: acarbose kinase (26 Jun 1999) |