provitamin A

provitamin A

noun

Origin:
1950–55

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American Heritage
Medical Dictionary

provitamin A n.
Any of the carotenoids that are precursors of vitamin A and exhibit qualitatively the biological activity of beta-carotene; they are present in fish-liver oils, egg yolk, milk products, and green-leaf or yellow vegetables and fruits.

The American Heritage® Stedman's Medical Dictionary
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