\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}.