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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Acrita  \Ac"ri*ta\,  n.  pl  [NL.,  from  Gr  ?  indiscernible;  'a 
  priv.  +  ?  to  distinguish.]  (Zo["o]l.) 
  The  lowest  groups  of  animals,  in  which  no  nervous  system  has 
  been  observed.