opisthobranch

noun
opis·​tho·​branch | \ə-ˈpis-thə-ˌbraŋk \
plural opisthobranchs

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

Other Words from opisthobranch

opisthobranch adjective

First Known Use of opisthobranch

1851, in the meaning defined above

History and Etymology for opisthobranch

New Latin Opisthobranchia, from Greek opisthen behind (akin to Greek epi on) + branchia gills — more at epi-

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The first known use of opisthobranch was in 1851

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Britannica.com: Encyclopedia article about opisthobranch

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