‖A‐ceph″a‐la (�), n. pl. [NL., fr. Gr. �, adj. neut. pl., headless. See Acephal.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.