vitamin A

noun

Definition of vitamin A

: any of several fat-soluble vitamins (such as retinol) that are found especially in green or orange vegetables (such as carrots or spinach) and in animal products (such as egg yolk, butter, or liver) and whose deficiency in the animal body causes epithelial tissues to become keratinous (as in the eye with resulting visual defects)

Examples of vitamin A in a Sentence

Recent Examples on the Web

One cup of pumpkin contains more vitamin A than a cup of kale, more potassium than a banana, and more fiber than 1⁄2 cup of quinoa. Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, "The Best Pumpkin Health Benefits Every Fall Lover Needs to Know About," 14 June 2019 Retinol is a concentrated derivative of vitamin A, and is recommended by dermatologists and aestheticians as great for acne-prone skin and preventing signs of anti-aging. Maya Allen, Marie Claire, "I Tried Meghan Markle’s Favorite Beauty Products—Here’s What’s Worth Your Money," 24 May 2019 The yolk contains vitamins A, D, E and K, as well as omega 3 fatty acids. Sheah Rarback, miamiherald, "Study shows egg yolks are actually good for you | Miami Herald," 11 May 2018 Retinoids, which are derivatives of vitamin A, are able to exfoliate the top layer of skin cells at lightning speed. Hana Hong, Marie Claire, "The Secret to Jennifer Garner's Glowy, Ageless Skin," 8 Apr. 2019 All include vitamins and nutrients (such as calcium, iron, omega-3s, potassium, vitamin A and vitamin C) that are recommended for expecting and breastfeeding moms. Karla Walsh, Woman's Day, "The Best Breastfeeding Diet," 25 Feb. 2019 Antioxidants including vitamins A, C, and E can help to lighten dark under-eye circles. Talia Abbas, SELF, "Puffy Eyes, Dark Circles, and Bags: Dermatologists Explain the Difference," 8 Aug. 2018 These include calcium, magnesium, vitamin D, several B vitamins, vitamin A, vitamin K, potassium, iodine, selenium, borate, zinc, manganese, molybdenum, beta-carotene, and iron. Korin Miller, Allure, "Do You Need to Take a Multivitamin? Here's What Nutritionists Say," 3 May 2018 The Retinol Tonic, as it's called, delivers the benefits of everyone's favorite vitamin A derivative, plus the benefits of a hydrating toner. Sophie Wirt, Allure, "Pixi by Petra Launches the First-Ever Retinol Tonic," 19 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vitamin A.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of vitamin A

circa 1920, in the meaning defined above

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Statistics for vitamin A

Last Updated

21 Jun 2019

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Time Traveler for vitamin A

The first known use of vitamin A was circa 1920

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More Definitions for vitamin A

vitamin A

noun

Medical Definition of vitamin A

: any of several fat-soluble vitamins or a mixture of two or more of them whose lack in the animal body causes keratinization of epithelial tissues (as in the eye with resulting night blindness and xerophthalmia): as
a : a pale yellow crystalline highly unsaturated alicyclic alcohol C20H29OH that is found in animal products (as egg yolk, milk, and butter) and especially in marine fish-liver oils (as of cod, halibut, and shark) and that is used in various forms in medicine and nutrition

called also retinol, vitamin A1

b : a yellow viscous liquid alicyclic alcohol C20H27OH that contains one more double bond in a molecule than vitamin A1 and is less active biologically in mammals and that occurs especially in the liver oil of freshwater fish

called also vitamin A2

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