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orcein

orcein


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Orcein  \Or"ce*in\,  n.  (Chem.) 
  A  reddish  brown  amorphous  dyestuff,  ?,  obtained  from  orcin, 
  and  forming  the  essential  coloring  matter  of  cudbear  and 
  archil.  It  is  closely  related  to  litmus.