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]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Vitamin A — Systematic (IUPAC) name (2E,4E,6E,8E) 3,7 Dimethyl …   Wikipedia

  • vitamin A — 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… …   The Collaborative International Dictionary of English

  • vitamin A — 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] …   The Collaborative International Dictionary of English

  • 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] …   The Collaborative International Dictionary of English

  • Vitamin A — Retinoide (Vitamin A) und ihre Interkonversion Vitamin A bezeichnet mehrere chemische Verbindungen, die in allen Tieren biologische Funktionen haben. Sie werden teilweise direkt mit der Nahrung aufgenommen oder aus Carotinen (Provitamin A)… …   Deutsch Wikipedia

  • vitamin A — 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… …   The Collaborative International Dictionary of English

  • vitamin A — noun Date: circa 1920 any of several fat soluble vitamins (as retinol) found especially in animal products (as egg yolk, milk, or fish liver oils) or a mixture of them whose lack in the animal body causes epithelial tissues to become keratinous… …   New Collegiate Dictionary

  • vitamin A alcohol — 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… …   The Collaborative International Dictionary of English

  • Vitamin A deficiency — Infobox Disease Name = PAGENAME Caption = Retinol DiseasesDB = 13902 ICD10 = E50.9 ICD9 = ICD9|264.9 ICDO = OMIM = MedlinePlus = eMedicineSubj = med eMedicineTopic = 2381 MeshID = D014802 Vitamin A deficiency is common in developing countries but …   Wikipedia

  • vitamin A alcohol — 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… …   The Collaborative International Dictionary of English

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