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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Epistoma  \E*pis"to*ma\,  Epistome  \Ep"i*stome\,  n.  [NL.  epistoma, 
  fr  Gr  'epi`  upon  +  ?,  ?,  mouth.]  (Zo["o]l.) 
  a  The  region  between  the  antenn[ae]  and  the  mouth,  in 
  b  A  liplike  organ  that  covers  the  mouth,  in  most  Bryozoa. 
  See  Illust.,  under  {Entoprocta}.