n. (Chem.) A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; -- called also rhamnoxanthin. [ 1913 Webster ]

{ , a. (Chem.) Pertaining to, or drived from, frangulin, or a species (Rhamnus Frangula) of the buckthorn. [ 1913 Webster ]

Frangulinic acid (Chem.), a yellow crystalline substance, resembling alizarin, and obtained by the decomposition of frangulin. [ 1913 Webster ]