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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cephalothorax  \Ceph`a*lo*tho"rax\,  n.  [Cephalo-  +  thorax.] 
  The  anterior  portion  of  any  one  of  the  Arachnida  and  higher 
  Crustacea,  consisting  of  the  united  head  and  thorax.