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 Umbelliferæ, as galbanum, asafetida, etc. It is analogous to coumarin. Called also hydroxy- coumarin.

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 Umbelliferæ, as galbanum, asafetida, etc. It is analogous to coumarin. Called also hydroxy- coumarin.