Vitamin-a meaning

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.
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A yellow crystalline compound, C20 H30 O, extracted from egg yolks, milk, and cod-liver oil.
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A golden yellow oil, C20 H28 O, occurring chiefly in the livers of freshwater fish and having about 40 percent of the biological activity of vitamin A1 .
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A fat-soluble aliphatic alcohol, C20H29OH, 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, vitamin A1, having the formula above, and vitamin A2, C20H27OH.
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Any of various related fat-soluble compounds, especially vitamin A1 (retinol), obtained principally from milk, eggs, and liver or produced in the body from beta carotene in plant foods, and functioning in cell growth and differentiation, the visual system, and the immune system. Vitamin A deficiency can cause blindness and damage to epithelial tissues.
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A yellow crystalline compound, C20 H30 O, that is the principal form of vitamin A found in most vertebrates other than freshwater fish.
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A fat-soluble vitamin, C20 H28 O, occurring chiefly in freshwater fish and other freshwater vertebrates, where it is a component (in aldehyde form) of the retinal pigment porphyropsin.
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A fat-soluble vitamin important for normal vision, tissue growth, and healthy skin. It is found in fish-liver oils, milk, green leafy vegetables, and red, orange, and yellow vegetables and fruits. A deficiency of vitamin A in humans causes poor vision at night and damage to the skin and mucous membranes. Also called retinol. Chemical formula: C20H30O.
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(biochemistry) Any of several closely related fat-soluble vitamins that are essential for normal vision; retinol.
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