| aster | <cell biology> Star shaped cluster of microtubules radiating from the polar microtubule organising centre at the start of mitosis. (18 Nov 1997) |
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| asteraceae | The single, large family of flowering plants in the order asterales. The family is also known as compositae. (12 Dec 1998) |
| astereognosis | Synonym: tactile agnosia. Origin: G. A-priv. + stereos, solid + gnosis, knowledge (05 Mar 2000) |
| asterias | <zoology> A genus of echinoderms. Formerly the group of this name included nearly all starfishes and ophiurans. Now it is restricted to a genus including the commonest shore starfishes. Origin: NL, fr. Gr. Starred, fr. Star. Source: Websters Dictionary (01 Mar 1998) |
| asteridea | <zoology> A class of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is starshaped or pentagonal. Origin: NL, fr. Gr. See Asterias. Source: Websters Dictionary (01 Mar 1998) |
| asteridian | <zoology> Of or pertaining to the Asterioidea. A starfish; one of the Asterioidea. Source: Websters Dictionary (01 Mar 1998) |
| asterion | <anatomy> The point on the side of the skull where the lambdoid, parieto-mastoid and occipito-mastoid sutures. Origin: Gr. Starry. Source: Websters Dictionary (01 Mar 1998) |
| asteriosaponins | asteriosaponins |
| asteriotoxins | Toxic steroids produced by starfish (Asteroidea). (05 Mar 2000) |
| asteriscus | <anatomy> The smaller of the two otoliths found in the inner ear of many fishes. Origin: L, an asterisk. See Asterisk. Source: Websters Dictionary (01 Mar 1998) |
| asterism | 1. <astronomy> A constellation. A small cluster of stars. 2. An asterisk, or mark of reference. Three asterisks placed in this manner, <asterism/, to direct attention to a particular passage. 3. <chemistry> An optical property of some crystals which exhibit a star-shaped by reflected light, as star sapphire, or by transmitted light, as some mica. Origin: Gr, fr. Star; cf. F. Asterisme. Source: Websters Dictionary (01 Mar 1998) |
| asterixis | <clinical sign, neurology> Abnormal muscle tremor consisting of involuntary jerking of the hands. May be seen in liver disease. (27 Sep 1997) |
| asternal | <anatomy> Not sternal; said of ribs which do not join the sternum. Origin: Pref. A- not + sternal. Source: Websters Dictionary (01 Mar 1998) |
| asternia | Congenital absence of the sternum. (05 Mar 2000) |
| Asterococcus | Synonym: Mycoplasma. Origin: Mod. L. Fr. G. Aster, a star, + kokkos, a berry (05 Mar 2000) |
| sperm-aster | Cytocentrum with astral rays in the cytoplasm of an inseminated ovum; it is brought in by the penetrating spermatozoon and evolves into the mitotic spindle of the first cleavage division. Origin: sperm + G. Aster, a star (aster) (05 Mar 2000) |
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