1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Zygobranchia  \Zyg`o*bran"chi*a\,  n.  pl  [NL.,  from  Gr  ?  a  yoke 
  +  ?  a  gill.]  (Zo["o]l.) 
  A  division  of  marine  gastropods  in  which  the  gills  are 
  developed  on  both  sides  of  the  body  and  the  renal  organs  are 
  also  paired.  The  abalone  ({Haliotis})  and  the  keyhole  limpet 
  ({Fissurella})  are  examples. 

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