Definition of "retinol" [ret•i•nol]

• See vitamin A. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I think most of us just finished eating them for Thanksgiving and sweet potatoes have so much vitamin A the orange color as you can see is converted to beta-carotene that's converted to retinol, which is vitamin A in your body and so that helps fight, boost your immune system and fight off colds and flu."
• "Vitamin A: Also known as retinol, vitamin A only occurs in animal foods, but fruit and vegetables contain carotenoids, which are converted to vitamin A by our bodies."
• "The immediate receptor of the photon is a derivative of vitamin A, termed retinol."