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English definition of “vitamin A”

vitamin A

noun [U]    
a vitamin found in foods such as butter, egg yolk, milk, and fish oils, or produced in the body from the carotene in green vegetables with a lot of leaves or in orange vegetables. It is important for normal growth, healthy skin, and the ability to see well, especially at night.Vitamins and minerals → Synonym retinol
(Definition of vitamin A noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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