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 This twice-a-day treatment for your face has an anti-aging trifecta: vitamin A, chaga mushroom, and hyaluronic acid. ELLE, 28 Apr. 2022 Bakuchiol, a low-key vitamin A alternative, is starting to have its K-beauty moment, though. Devon Abelman, Allure, 16 Feb. 2022 Best of all, winter squash is loaded with vitamin A, which is important for boosting vision and the immune system. Bethany Thayer, Detroit Free Press, 15 Jan. 2022 Some heavy hitters include vitamin B3 (niacinamide), vitamin A (retinol), and vitamin C, all proven to repair and resurface the skin with visible results. The Salt Lake Tribune, 7 Apr. 2022 Like the name says, this no-frills oil is nothing but pure rose hip seed oil and all its vitamin A and linoleic acid goodness. Megan Mcintyre, Better Homes & Gardens, 16 Feb. 2022 Once the powder is delivered, it will be combined in a tank with 2 percent milk, cane sugar and small amounts of vitamin A and vitamin D. Washington Post, 3 Feb. 2022 Sweet potatoes are also powerhouses of vitamin A, which comes from the beta-carotene pigment that gives them their gorgeous golden color. Casey Barber, CNN, 25 Mar. 2022 The new pill created by a team at the University of Minnesota blocks proteins from binding to vitamin A, which is known to be crucial to fertility and virility in mammals, per Gizmodo’s Ed Cara. Corryn Wetzel, Smithsonian Magazine, 25 Mar. 2022 See More

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.

First Known Use of vitamin A

circa 1920, in the meaning defined above

Buying Guide

Our Reviews team has selected the best multivitamins.

Learn More About vitamin A

Time Traveler for vitamin A

Time Traveler

The first known use of vitamin A was circa 1920

See more words from the same year

Dictionary Entries Near vitamin A


vitamin A

vitamin B

See More Nearby Entries 

Statistics for vitamin A

Last Updated

6 May 2022

Cite this Entry

“Vitamin A.” Dictionary, Merriam-Webster, Accessed 16 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

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


Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!