vitamin Avitamin A2
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
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.
A yellow crystalline compound, C20H30O, that is the principal form of vitamin A found in most vertebrates other than freshwater fish. Also called retinol .
A fat-soluble vitamin, C20H28O, occurring chiefly in freshwater fish and other freshwater vertebrates, where it is a component (in aldehyde form) of the retinal pigment porphyropsin.