‖Py′go‐bran″chi‐a (?), n. pl. [NL., fr. Gr. πuγή the rump + � a gill.] (Zoöl.) A division of opisthobranchiate mollusks having the branchiæ in a wreath or group around the anal opening, as in the genus Doris.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.