1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Prosobranchiata \Pros'o*bran'chi*a"ta\, noun pl. [NL., fr. Gr. ? forward, further + ? a gill.] (Zo["o]l.) 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.

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