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Meaning of VITAMIN A

WordNet Dictionary
[n]  any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
 Synonyms: A, antiophthalmic factor, axerophthol
 See Also: dehydroretinol, fat-soluble vitamin, retinol, vitamin A1, vitamin A2



Medical Dictionary
 Definition: A substance used in cancer prevention; it belongs to the family of drugs called retinoids.
Biology Dictionary
 Definition: Any chemical relative of retinol; this vitamin is the precursor of visual pigments and is vital for the differentiation of epithelial tissues. It is thought to have anticancer properties and is used to treat skin problems such as acne, wrinkling and icthyosis. This vitamin is found in liver oils and is synthesized from carotenoids.