The Collaborative International Dictionary of English v.0.48:
Xylose \Xy"lose\, n. [Pref. xylo- + -ose.] (Chem.) An unfermentable sugar of the pentose class, C5H10O5, formed by the hydrolysis of xylan; wood sugar. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
xylose n 1: a sugar extracted from wood or straw; used in foods for diabetics [syn: wood sugar, xylose]