tetrose

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A monosaccharide containing no more than four carbon atoms in its primary chain.

from The Century Dictionary.

• noun In organic chemistry, the class-name applied to those sugars which contain four atoms of carbon in the molecule.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A monosaccharide derived from a certain alcohol.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry A sugar or saccharide containing four carbon atoms.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any monosaccharide sugar containing four atoms of carbon per molecule