vitamin A

noun

: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Kennedy has downplayed the outbreak, even miscounting deaths, and has suggested remedies, such as vitamin A, to prevent measles that experts advise against. Eduardo Cuevas, USA TODAY, 7 Mar. 2025 Moving backward The response has only bolstered a dangerous trend among some parents to embrace vitamin A and cod liver oil, which is rich in vitamin A, to prevent or treat measles—a trend doctors' groups have been quick to try to combat. Ars Technica, 7 Mar. 2025 Juicing with vegetables like carrots, spinach, and sweet potatoes increases your vitamin A and carotenoids intake.910 Juices made with leafy greens, berries, citrus fruits, kiwifruit, and strawberries boost vitamin C, which is important for collagen production. Melissa Nieves, Verywell Health, 7 Mar. 2025 Kennedy’s statement on measles vaccination also appeared in the piece after a paragraph emphasizing treatment, such as vitamin A, for people who are sick. Meg Tirrell, CNN, 3 Mar. 2025 See All Example Sentences for vitamin A

Word History

First Known Use

circa 1920, in the meaning defined above

Time Traveler
The first known use of vitamin A was circa 1920

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Cite this Entry

“Vitamin A.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20A. Accessed 12 Mar. 2025.

Kids Definition

vitamin A

noun
: any of several vitamins or a mixture of them that are found especially in green and orange vegetables (as carrots or spinach) and animal products (as egg yolk, butter, or liver) and are needed especially for good vision

Medical Definition

vitamin A

noun
: 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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