Defn: An unfermentable sugar of the pentose class, C5H10O5, formed by the hydrolysis of xylan; wood sugar.

XYLOSTEIN
Xy*los"te*in, n. Etym: [Xylo- + Gr. (Chem.)

Defn: A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance.

XYLOTILE
Xy"lo*tile, n.

Defn: Same as Parkesine.

XYLOTOMIST
Xy*lot"o*mist, n.

Defn: One versed or engaged in xylotomy.

XYLOTOMOUS
Xy*lot"o*mous, a. [Pref. xylo-+ root of Gr. to cut.] (Zoöl.)

Defn: Capable of boring or cutting wood; — said of many insects.

XYLOTOMY
Xy*lot"o*my, n. [Pref. xylo-+ -tomy.]