(Chem.) A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; - called also rhamnoxanthin.
frangulin
enUK
fran·gu·lin
(frang'gū-lin), A glycoside from frangula; has been used as a purgative. Synonym(s): rhamnoxanthin