Main Entry: pros·o·branch

Pronunciation: \ˈprä-sə-ˌbraŋk\

Function: noun

Inflected Form(s): plural pros·o·branchs

Etymology: New Latin Prosobranchia, from proso- in front (from Greek prosō forward) + branchia gills (from Greek)

Date: 1851

: any of a subclass (Prosobranchia) of gastropod mollusks that have the loop of visceral nerves twisted into a figure eight, the sexes usually separate, and usually an operculum

— prosobranch adjective