prosobranchiata Meaning, Definition & Usage

Pros`o*bran`chi*a"ta noun plural
Etymology
NL., fr. Gr. forward, further + a gill.
Definitions
  1. (Zoöl.) 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.

Webster 1913