prosobranch

noun

pros·​o·​branch ˈprä-sə-ˌbraŋk 

plural prosobranchs

: 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

Word History

Etymology

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

First Known Use

1851, in the meaning defined above