citrene / citrin / citrine [ˈsɪtrin]
citrene – n. – dextrotoratory limonene
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
citrine – n. & adj. – n. – a transparent, yellow variety of quartz also called false topaz; adj. – lemon coloured