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 (as in the eye with resulting visual defects)

New Collegiate Dictionary. 2001.

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

  • vitamin A — a yellow, fat soluble, solid terpene alcohol, C20H30O, obtained from carotene and occurring in green and yellow vegetables, egg yolk, etc.: essential to growth, the protection of epithelial tissue, and the prevention of night blindness. Also… …   Universalium

  • Vitamin A — is retinol. Carotene compounds (found, for example, in egg yolk, butter and cream) are gradually converted by the body to vitamin A (retinol). A form of vitamin A called retinal is responsible for transmitting light sensation in the retina of the …   Medical dictionary

  • vitamin A — n. 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… …   English World dictionary

  • 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 — A family of nutrients needed by the body for vision, bone growth, reproduction, cell division, and cell differentiation. Vitamin A also helps the immune system protect the body against many types of infections. Foods with vitamin A include animal …   English dictionary of cancer terms

  • 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 — vitamin A. = retinol (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Vitamin A — ⇒ Axerophthol …   Deutsch wörterbuch der biologie

  • 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

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