The Collaborative International Dictionary of English v.0.48:

deoxyribose \deoxyribose\ n.
   a pentose (C5H10O4) in which one of the hydroxyl groups of
   ribose has been replaced by a hydrogen. In deoxyribonucleic
   acids, the deoxyribose is D-2-deoxyribose, in which the
   hydroxyl at the 2 position of ribose is the one which is
   replaced by hydrogen.
   [PJC]

WordNet (r) 3.0 (2006):

deoxyribose
    n 1: a sugar that is a constituent of nucleic acids