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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Aril  \Ar"il\,  Arillus  \A*ril"lus\,  n.  [From  LL  arilli  dry 
  grapes,  perh.  fr  L.  aridus  dry:  cf  F,.  arille.]  (Bot.) 
  A  exterior  covering,  forming  a  false  coat  or  appendage  to  a 
  seed,  as  the  loose,  transparent  bag  inclosing  the  seed  or  the 
  white  water  lily.  The  mace  of  the  nutmeg  is  also  an  aril.