Definition of "vitamin a1" [vitamin a1]

• Retinol (C20H30O), one of the substances also called vitamin A. It is also called more specifically vitamin A alcohol. It is a required factor for human nutrition. The USP unit of activity is equal to 0.30 micrograms of retinol. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)