[proh-vahy-tuh-min; British also proh-vit-uh-min]
noun Biochemistry.
a substance that an organism can transform into a vitamin, as carotene, which is converted to vitamin A in the liver.

1925–30; pro-1 + vitamin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
provitamin (prəʊˈvɪtəmɪn)
a substance, such as carotene, that is converted into a vitamin in animal tissues

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

provitamin pro·vi·ta·min (prō-vī'tə-mĭn)
A vitamin precursor that is converted to its active form through normal metabolic processes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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