Meaning of PROVITAMIN

Pronunciation:			prow'vItumin
WordNet Dictionary
	Definition:		[n]  vitamin precursor; a substance that is converted into a vitamin in animal tissues
	Websites:
	See Also:		carotene, carotin, hydrocarbon, provitamin A
Biology Dictionary
	Definition:		A chemical that becomes a vitamin via a natural reaction within an organism, such as when 7-dehydrocholesterol in the skin becomes vitamin D when it's exposed to sunlight.