opisthobranch
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.opis·tho·branch
noun \ə-ˈpis-thə-ˌbraŋk\ plural opis·tho·branchs
Definition of OPISTHOBRANCH
: any of a subclass (Opisthobranchia) of marine gastropod mollusks that have the gills when present posterior to the heart and often lack a shell
— opisthobranch adjective
Origin of OPISTHOBRANCH
New Latin Opisthobranchia, from Greek opisthen behind (akin to Greek epi on) + branchia gills — more at epi-
First Known Use: circa 1856
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