1. 
   Provitamin
   A provitamin is a substance that may be converted within the body to a vitamin. The term "previtamin" is a synonym. For example, Provitamin B5 is a name for Panthenol, which may be converted in the body to Pantothenic Acid (Vitamin B5). The term "provitamin" is used when it is desirable to label a ...
   Found op http://en.wikipedia.org/wiki/Provitamin
   
   
2. 
   provitamin
   [n] - vitamin precursor
   Found op http://www.webdictionary.co.uk/definition.php?query=provitamin
   
   
3. 
   provitamin
   A chemical that becomes a vitaminvia a natural reaction within anorganism, such as when 7-dehydrocholesterol in the skin becomes vitamin Dwhen its exposed to sunlight. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?provitamin
   
   
4. 
   provitamin
   noun vitamin precursor; a substance that is converted into a vitamin in animal tissues
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=provitamin
   
   
5. 
   provitamin
   (pro-vi´tә-min) a substance (such as ergosterol) from which an animal organism can form a vitamin.
   Found op http://www.encyclo.co.uk/local/21001
   
   
6. 
   provitamin
   (from the article `vitamin`) ...and cholecalciferol (vitamin D3). Vitamin D3 represents the dietary source, while vitamin D2 occurs in yeasts and fungi. Both can be formed from ...
   Found op http://www.britannica.com/eb/a-z/p/125
   
   
7. 
   provitamin
   Type: Term Pronunciation: prō-vī′tă-min Definitions: 1. A substance that can be converted into a vitamin; β-carotene.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=73212
   
   
8. 
   provitamin
   Any precursor substance of a vitamin. Provitamins are ingested substances that become converted to active vitamins within the organism. One example is ergosterol (provitamin D₂), which through the action of sunlight is converted to calciferol (vitamin D₂); another example is be...
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0028556.html
   
   
9. 
   provitamin
   1) Hydrocarbon 2) Vitamin precursor
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/provitamin/1
   
   

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