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

These range from protein to zinc, iron, choline, folate, iodine, vitamin A, vitamin D, vitamin B6, and vitamin B12. Valerie Sweeten, Houston Chronicle, "Healthy meals involve preplanning, interaction," 31 July 2019 Corn also supplies about 10 times more vitamin A than other grains. Cynthia Sass, Mph, Health.com, "4 Health Benefits of Corn," 12 Aug. 2019 Oral vitamin A basically shuts down your sebaceous glands. Jessica Cruel, SELF, "12 Acne Treatments That Really Work, According to Dermatologists," 8 Aug. 2019 But the concentrations of vitamin A and arachidonic acid weren't even measured. Marta Zaraska, chicagotribune.com, "Be leery about vegetarian diets for your pets," 10 July 2019 Skim milk is routinely fortified with vitamin A (which prevents blindness, and which is removed in the skimming process). Kelsey Piper, Vox, "Mississippi is forbidding grocery stores from calling veggie burgers “veggie burgers”," 3 July 2019 Poreless Face Primer, $6 This primer’s lightweight formula is infused with tea tree and vitamins A and E to smooth and hydrate the skin. Tiffany Dodson, SELF, "13 Products That Make It Look Like I Got 8 Hours of Sleep When I Simply Did Not," 5 Mar. 2019 For even more nutritional value, go for a sweet potato, which is high in fiber and vitamins A and C. Photo: Shutterstock 5. Danielle Braff, Woman's Day, "8 Ways to Stay Full Longer," 9 Nov. 2010 Multivitamins and other supplements — including selenium, vitamin A, vitamin B6, vitamin C, vitamin E, vitamin D alone, calcium alone, folic acid and iron — did not have a significant effect on death or heart disease, according to the study. Steven Reinberg, chicagotribune.com, "More evidence supplements won’t help the heart," 11 July 2019

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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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