vitamin A

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vitamin A

n.
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.

vitamin A1

n.
A yellow crystalline compound, C20H30O, that is the principal form of vitamin A found in most vertebrates other than freshwater fish. Also called retinol.

vitamin A2

n.
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

vitamin A

n
(Elements & Compounds) a fat-soluble yellow unsaturated alcohol occurring in green and yellow vegetables (esp carrots), butter, egg yolk, and fish-liver oil (esp halibut oil). It is essential for the prevention of night blindness and the protection of epithelial tissue. Formula: C20H30O. Also called: vitamin A1 or retinol
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

vitamin A


n.
a yellow, fat-soluble terpene alcohol, C20H30O, obtained from carotene and occurring in green and yellow vegetables, egg yolk, etc.: essential to the protection of epithelial tissue and the prevention of night blindness. Also called vitamin A1, retinol.
[1920–25]

vitamin A2


n.
a yellow oil, C20H28O, similar to vitamin A, obtained from fish liver.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

vitamin A

A vitamin important for normal vision, tissue growth, and healthy skin. It is found in fish-liver oils, milk, green leafy vegetables, and yellow vegetables and fruits. Also called retinol.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.vitamin A - any of several fat-soluble vitamins essential for normal visionvitamin A - any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
fat-soluble vitamin - any vitamin that is soluble in fats
retinol, vitamin A1 - an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene
dehydroretinol, vitamin A2 - a viscous alcohol that is less active in mammals than is vitamin A1
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.