Definition of prosobranch
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
adjectiveFrom the M-W Editors
Origin and Etymology of prosobranch
New Latin Prosobranchia, from proso- in front (from Greek prosō forward) + branchia gills (from Greek)
First Known Use: 1851
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Britannica.com: Encyclopedia article about prosobranch
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