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

While tallow isn’t for vegans and vegetarians, those open to it can benefit from its high doses of vitamins A, D, E and K. Mater Soap Arbor Hand and Body Soap ($24 at matersoap.com). Olivia Hall, The Seattle Times, "Stressful times call for an all-natural spa day," 15 Oct. 2018 The paper names 12 nutrients key to managing depression and anxiety: folate (vitamin B9), iron, long-chain omega-3 fatty acids, magnesium, potassium, selenium, thiamine (vitamin B1), vitamin A, vitamin B6, vitamin B12, vitamin C and zinc. Kathleen Squires, WSJ, "Feed Your Head: Foods That Target Depression and Anxiety," 26 July 2018 Very high in vitamin A, carrots also contain vitamin K, beta-carotene, fiber and phytochemicals. Allison Horton, miamiherald, "Want to reduce your odds of getting cancer? Stay active, lose weight and eat healthy," 25 May 2018 Amazingly, purslane also boasts seven times more vitamin A than carrots and six times more vitamin E than spinach. Ashleigh Spitza, Milwaukee Journal Sentinel, "Purslane may be growing in your lawn; for better health, put it in your diet," 10 July 2018 Bio-Oil contains vitamin A, which helps boost collagen production, and vitamin E, which protects the skin against the effects of free radicals that can weaken and damage skin. Emily Rekstis, SELF, "9 Ways to Use Bio-Oil, the Drugstore Scar Treatment People Love," 22 June 2018 Cooking in hot water rids the plant of its stinging hairs and creates a nutritious soup rich in vitamins A and C, as well as calcium. Sunset, "Top 10 Medicinal Plants You Can Grow at Home," 22 Jan. 2018 One cup of mangos is 100 calories and provides 100 percent of vitamin C, 20 percent of folate, 35 percent of vitamin A and a smattering of calcium, copper and iron. Sheah Rarback, miamiherald, "Ubiquitous mangos taste good - and are good for you, too," 29 June 2018 For example, vitamin A in excess amounts can cause headaches, while excess iron can cause nausea, per the NIH. Carolyn L. Todd, SELF, "Primary Care Doctors Share 9 Ways to Get the Most Out of Your Annual Checkup," 31 May 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

6 Dec 2018

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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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