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pros·o·branch | \ ˈprä-sə-ˌbraŋk 
\
\ plural prosobranchs
Definition of prosobranch
: 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
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The first known use of prosobranch was in 1851
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