Illustrated Glossary of Organic Chemistry

Aldaric acid: A carbohydrate in which both terminal groups (either alcohols or aldehydes) have been oxidized to carboxylic acids.

D-glucose An aldohexose		D-gluconic acid An aldonic acid		D-glucaric acid An aldaric acid

Oxidizing the aldehyde of D-glucose produces D-gluconic acid (an aldonic acid). Further oxidation of the terminal primary alcohol gives D-glucaric acid (an aldaric acid).