- a yellow, crystalline, slightly water-soluble powder, C15H10O7, obtained from the bark of the quercitron and other vegetable substances, used as a yellow dye; flavin.
- a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C 15 H 10 O 7; melting pt: 316–7°C
