xylitolPronunciation: /ˈzʌɪlɪtɒl/Definition of xylitol noun [mass noun] Chemistry a sweet-tasting crystalline alcohol derived from xylose, present in some plant tissues and used as an artificial sweetener in foods. Chemical formula: CH2OH(CHOH)3CH2OH Origin: late 19th century: from xylose + -ite1 + -olxylitol in other Oxford dictionaries Definition of xylitol in the US English dictionary