Source : Webster's Revised Unabridged Dictionary (1913)

Xylose \Xy"lose\, n. [Pref. xylo- + -ose.] (Chem.)
   An unfermentable sugar of the pentose class, {C5H10O5},
   formed by the hydrolysis of xylan; wood sugar.

Source : WordNet®

xylose
     n : a sugar extracted from wood or straw; used in foods for
         diabetics [syn: {wood sugar}]