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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cephalata  \Ceph`a*la"ta\,  n.  pl  [NL.,  fr  Gr  ?  head.] 
  A  large  division  of  Mollusca,  including  all  except  the 
  bivalves;  --  so  called  because  the  head  is  distinctly 
  developed.  See  Illustration  in  Appendix.