The Collaborative International Dictionary of English v.0.48:
Tetrose \Tet"rose\, n. [Tetra- + -ose.] (Chem.) A monosaccharide derived from a certain alcohol. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
tetrose n 1: any monosaccharide sugar containing four atoms of carbon per molecule