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provitamin
pro·vi·ta·min [ prō vtəmin ] (plural pro·vi·ta·mins)


noun 
Definition:
 
vitamin precursor: a chemical compound precursor that is converted to a vitamin during normal biochemical processes
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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