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A vitamin precursor; assumes vitamin activity upon activation or chemical change.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a biochemical precursor of a vitamin. Provitamin A (carotene), which is synthesized by plant cells, forms the A vitamins in animal cells. Ergosterol and its derivatives form the calciferols, the D vitamins.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.