Source : Webster's Revised Unabridged Dictionary (1913)

Umbelliferone \Um`bel*lif"er*one\, n. (Chem.)
   A tasteless white crystalline substance, {C9H6O3}, found in
   the bark of a certain plant ({Daphne Mezereum}), and also
   obtained by the distillation of certain gums from the
   {Umbellifer[ae]}, as galbanum, asafetida, etc. It is
   analogous to coumarin. Called also {hydroxy-coumarin}.