1. 
   Prosobranchiata
   Pros`o·bran`chi·a'ta noun plural [ New Latin , from Greek ... forward, further + ... a gill.] (Zoology) The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the hear...
   Found op http://www.encyclo.co.uk/webster/P/178
   
   
2. 
   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) ...
   Found op http://www.mondofacto.com/facts/dictionary?prosobranchiata
   
   
3. 
   Prosobranchiata
   • (n. pl.) 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.
   Found op http://thinkexist.com/dictionary/meaning/prosobranchiata/
   
   

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