| acephala | <zoology> That division of the Mollusca which includes the bivalve shells, like the clams and oysters; so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca. Origin: NL, fr. Gr, adj. Neut. Pl, headless. See Acephal. Source: Websters Dictionary (01 Mar 1998) |
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| acephalan | Same as Acephal. <zoology> Belonging to the Acephala. Source: Websters Dictionary (01 Mar 1998) |
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