n. [ Cf. F. quercitrin. See Quercitron. ] (Chem.) A glucoside extracted from the bark of the oak (Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron. [ 1913 Webster ]

n. (Chem.) A yellow crystalline glucoside obtained from the pansy (Viola tricolor), and decomposing into glucose and quercitrin. [ 1913 Webster ]