| 单词 | provitamin a |
| 释义 | provitamin Anouncarotene. Origin of provitamin AFirst recorded in 1950–55 Words nearby provitamin Aprovisional, Provisional Wing of the Irish Republican Army, proviso, provisory, provitamin, provitamin A, provitamin D2, provo, provocateur, provocation, provocative Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Medical definitions for provitamin Aprovitamin 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, green-leaf or yellow vegetables, and fruits. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. |
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