Pronunciation: ə - ' pis-th ə - ˌ bra ŋ k
Function: noun
Inflected Form: plural -branchs
Etymology: New Latin Opisthobranchia, from Greek opisthen behind (akin to Greek epi on) + branchia gills ― more at EPI-
Date: circa 1856
: 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