vitamin A


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 Plus, elderberries are loaded with vitamin A, which is shown to regulate immune response, and flavonoids, a chemical found in plants, including anthocyanins, which give them their signature dark purple color. Erica Sweeney, Good Housekeeping, "5 Ways Elderberry Syrup Benefits Your Health, According to Experts," 27 Jan. 2021 And Accutane — a drug used to treat severe acne — is actually an oral vitamin A called isotretinoin. Julie Ricevuto, Allure, "The Science of Beauty: The Complete Guide to Vitamins for Skin Health," 12 Nov. 2020 Included in the elixir are nine nutrient dense oils including bakuchiol (a retinol alternative), an organic amla (a vitamin C superfood), and a vitamin A-rich cacay. Roxanne Adamiyatt, Town & Country, "Gwyneth Paltrow Launches the Latest Goop Product In the Most Relatable Way Possible," 4 Jan. 2021 If all else fails, retinoids and retinol (a milder version), both vitamin A derivatives, can also be extremely effective in treating blackheads. Dori Price, Good Housekeeping, "How to Get Rid of Blackheads, According to Skincare Pros and Dermatologists," 1 Dec. 2020 Nutritionally, roots have a lot to offer, too, with carrots particularly high in vitamin A, and others rich in vitamin C, potassium, fiber, calcium and magnesium, to mention a few highlights. Washington Post, "Hearty winter vegetables are at the root of this red wine chicken stew," 21 Jan. 2021 But again, these are all forms of vitamin A, which can help your skin cells turn over more quickly when applied topically. Jessica Cruel, SELF, "How to Manage Retinization When Using Retinoids," 26 Dec. 2020 The delicious taste you love with the nutrition of 10 essential vitamins and minerals when mixed with lowfat vitamin A & D milk. cleveland, "Hot chocolate, anyone? We tasted and ranked 61 cocoa mixes from grocery stores," 11 Dec. 2020 Butternut squash is loaded with vitamin A, a key nutrient for good vision and a healthy immune system. Darlene Zimmerman, Detroit Free Press, "3 easy-to-prepare and healthful Thanksgiving side dishes," 14 Nov. 2020

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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Time Traveler for vitamin A

Time Traveler

The first known use of vitamin A was circa 1920

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Statistics for vitamin A

Last Updated

23 Feb 2021

Cite this Entry

“Vitamin A.” Dictionary, Merriam-Webster, Accessed 6 Mar. 2021.

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More Definitions for vitamin A

vitamin A


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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