Dictionary![]() ![]() o•pis•tho•branchPronunciation: (u-pis'thu-brangk"), [key] —n. any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles. —adj. of or pertaining to the opisthobranches. Also,o•pis•tho•bran•chi•atePronunciation: (u-pis"thu-brang'kē-it, -āt"). [key] Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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