The Collaborative International Dictionary
vitamin A2
vitamin A2 \vitamin A2\ n. dehydroretinol ( C20H28O), one of the substances also called vitamin A. It has about 40% of the bioactivity of vitamin A1.
Syn: dehydroretinol.
WordNet
vitamin A2
n. a viscous alcohol that is less active in mammals than is vitamin A1 [syn: dehydroretinol]