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Definition of retinol noun from the Oxford Advanced Learner's Dictionary

retinol

noun
 
/ˈretɪnɒl/
 
/ˈretɪnɑːl/
(also vitamin A)
[uncountable] (biology)
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  1. a vitamin found in cheese, eggs, fish oils and milk that is essential for healthy growth and good vision
    Word Origin1960s: from retina + -ol.

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