‖Ceph′a‐la″ta (?), n. pl. [NL., fr. Gr. κεφαλή head.] (Zoöl.) A large division of Mollusca, including all except the bivalves; — so called because the head is distinctly developed. See Illustration in Appendix.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.