citrin / citron [ˈsɪtrən]
citrin – n. – a crystalline, water-soluble flavonoid concentrate that was originally prepared from lemons and was considered to be a source of vitamin P and to consist of hesperidin and eriodictyol glycoside and that is now used as a source of bioflavonoids
citron – n. – 1. a shrubby tree, Citrus medica, bearing large lemon-like fruits with thick fragrant peel; 2. this fruit; 3. the candied peel of this fruit used in baking