| Prosobranch | n. (Zool.) One of the Prosobranchiata. [ 1913 Webster ] |
| Prosobranchiata | ‖n. pl. [ NL., fr. Gr. &unr_; forward, further + &unr_; a gill. ] (Zool.) 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. [ 1913 Webster ] |