vitamin A(redirected from vitamin A A excess)
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vitamin A[′vīd·ə·mən ¦ā]
C20H29OH A pale-yellow alcohol that is soluble in fat and insoluble in water; found in liver oils and carotenoids, and produced synthetically; it is a component of visual pigments and is essential for normal growth and maintenance of epithelial tissue. Also known as antiinfective vitamin; antixerophthalmic vitamin; retinol.