An enzyme that oxidizes an aldehyde in the presence of NAD+ and water to an acid and NADH. This enzyme was formerly classified as EC 1.1.1.70.

Synonyms: Aldehyde:NAD+ oxidoreductase, D-Glucuronolactone Dehydrogenase, D Glucuronolactone Dehydrogenase, Aldehyde Dehydrogenase (NAD(+)), Aldehyde Dehydrogenase, Aldehyde-NAD Oxidoreductase, 0, Aldehyde NAD Oxidoreductase, Aldehyde Dehydrogenase E1, Dehydrogenase, D-Glucuronolactone, Aldehyde Dehydrogenase E2, EC 1.2.1.3, Dehydrogenase, Aldehyde