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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Coumarin  \Cou"ma*rin\  (k[=oo]"m[.a]*r[i^]n),  n.  [F.,  fr 
  coumarou,  a  tree  of  Guiana.]  (Chem.) 
  The  concrete  essence  of  the  tonka  bean,  the  fruit  of 
  {Dipterix  (formerly  Coumarouna)  odorata}  and  consisting 
  essentially  of  coumarin  proper,  which  is  a  white  crystalline 
  substance,  {C9H6O2},  of  vanilla-like  odor,  regarded  as  an 
  anhydride  of  coumaric  acid,  and  used  in  flavoring.  Coumarin 
  in  also  made  artificially.