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Definition of Opisthobranch
1. Noun. Any of a large and diverse group of specialized complex marine gastropods previously united under ''Opisthobranchia'' within the ''Heterobranchia'', characterized by two pairs of tentacles and a single gill behind and to the right of the heart. ¹
¹ Source: wiktionary.com
Definition of Opisthobranch
1. [n -S]