Prosobranchiata
Pronunciation : Pros`o*bran`chi*a"ta
Part of Speech : n.
Etymology : [NL., fr. Gr. (Zo?l.)
Definition : Defn: The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate.
pl.
Source : Webster's Unabridged Dictionary, 1913