{ ‖O‐pis′tho‐bran″chi‐a (?), O‐pis′tho‐bran′chi‐a″ta (?), } n. pl. [NL., from Gr. ὄπισθεν behind + � gills.] (Zoöl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.