SINCE 1828
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
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