- - p. A trivial name for carotenoids exhibiting qualitatively the biologic activity of β-carotene, i.e., vitamin A precursors (α-, β-, and γ-carotene and cryptoxanthin); contained in fish liver oils, spinach, carrots, egg yolk, milk products, and other green leaf or yellow vegetables and fruits.- p. D3 SYN: 7-dehydrocholesterol.
* * *pro·vi·ta·min (')prō-'vīt-ə-mən n a precursor of a vitamin convertible into the vitamin in an organism <ergosterol is a \provitamin of vitamin D>
* * *n.a substance that is not itself a vitamin but can be converted to a vitamin in the body. An example is b-carotene, which can be converted into vitamin A.
* * *pro·vi·ta·min (pro-viґtə-min) a precursor of a vitamin.
Medical dictionary. 2011.