Found 2 items, similar to vitamin A.
English → English (WordNet) Definition: vitamin A vitamin A n : any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes [syn: antiophthalmic factor, axerophthol, A]
English → English (gcide) Definition: vitamin A Retinol \Ret"i*nol\, n. [Gr. ??? resin + L. oleum oil.] 1. (Chem.) A hydrocarbon oil C32H16, obtained by the distillation of resin, -- used as a solvent, as an antiseptic, and in printer's ink. [1913 Webster +PJC] 2. One of the compounds which function as vitamin A. Called also vitamin A, vitamin A1 and vitamin A alcohol. See vitamin A1. [PJC] vitamin A \vitamin A\ n. any of several related fat-soluble vitamins (such as retinol) essential for normal vision; it also prevents night blindness or inflammation or dryness of the eyes. Syn: antiophthalmic factor, axerophthol. [WordNet 1.5] vitamin A1 \vitamin A1\ n. retinol (C20H30O), one of the substances also called vitamin A. It is also called more specifically vitamin A alcohol . It is a required factor for human nutrition. The USP unit of activity is equal to 0.30 micrograms of retinol. Syn: retinol. [WordNet 1.5 +PJC] vitamin A2 \vitamin A2\ n. dehydroretinol (C20H28O), one of the substances also called vitamin A. It has about 40% of the bioactivity of vitamin A1. Syn: dehydroretinol. [WordNet 1.5 +PJC] axerophthol \axerophthol\ n. 1. a vitamin essential for normal vision (C20H30O); it prevents night blindness or inflammation or dryness of the eyes; same as vitamin A. One U.S.P. unit of vitamin A is equivalent to 0.30 micrograms of pure vitamin A alcohol. Syn: vitamin A; vitamin A alcohol; antiophthalmic factor; biosterol; retinol; A. [WordNet 1.5 +PJC]