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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Epidote  \Ep"i*dote\,  n.  [Gr.  ?  to  give  besides;  ?  over  +  ?  to 
  give:  cf  F.  ['e]pidote.  So  named  from  the  enlargement  of  the 
  base  of  the  primary,  in  some  of  the  secondary  forms.]  (Min.) 
  A  mineral,  commonly  of  a  yellowish  green  (pistachio)  color, 
  occurring  granular,  massive,  columnar,  and  in  monoclinic 
  crystals.  It  is  a  silicate  of  alumina,  lime,  and  oxide  of 
  iron,  or  manganese. 
  Note:  The  Epidote  group  includes  ordinary  epidote,  zoisite  or 
  lime  epidote,  piedmontite  or  manganese  epidote, 
  allanite  or  serium  epidote.