vitamin Avitamin A
a fat-soluble aliphatic alcohol, CHOH, found in fish-liver oil, egg yolk, butter, etc. or derived from carotene in carrots and other vegetables: a deficiency of this vitamin results in night blindness, a general susceptibility to infections, and degeneration of epithelial tissue; retinol: it usually occurs in two forms, , having the formula above, and , CHOH
A yellow crystalline compound, C20H30O, extracted from egg yolks, milk, and cod-liver oil.
A golden yellow oil, C20H28O, occurring chiefly in the livers of freshwater fish and having about 40 percent of the biological activity of vitamin A1.
A fat-soluble vitamin or a mixture of vitamins, especially vitamin A1 or a mixture of vitamins A1 and A2, occurring principally in fish-liver oils, milk, and some yellow and dark green vegetables, and functioning in normal cell growth and development. Vitamin A deficiency can cause damage to epithelial cells, resulting in hardening and roughening of the skin, degeneration of mucous membranes, and night blindness. Also called retinol.