| prosobranch | <zoology> One of the Prosobranchiata. Source: Websters Dictionary (01 Mar 1998) |
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| prosobranchiata | <marine biology, zoology> 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. Origin: NL, fr. Gr. Forward, further + a gill. (19 Mar 1998) |