Source : Webster's Revised Unabridged Dictionary (1913)

Triose \Tri"ose\, n. [Tri- + -ose.] (Chem.)
   (a) A sugar derived from a trihydric alcohol.
   (b) A trisaccharide.

Source : WordNet®

triose
     n : any monosaccharide sugar containing three atoms of carbon
         per molecule