vitamin A

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.

Look at other dictionaries:

  • 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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