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 Spinach is already rich in vitamin A, lutein, folate, vitamin C, calcium, iron, phosphorus, and potassium. Chase Purdy, Quartz, "The USDA is turning spinach red to boost veggie consumption," 7 Nov. 2019 But its nutritional profile -- lots of fiber, potassium, vitamin A and vitamin C -- is slightly more impressive. Sandee Lamotte, CNN, "Top 34 bestselling 'fruit' drinks for kids deemed unhealthy," 16 Oct. 2019 Retinol is a vitamin A derivative and the over-the-counter version of prescription retinoids. NBC News, "How to reduce dark under-eye circles, according to dermatologists," 29 Jan. 2020 Retinol Derivatives of vitamin A get converted by skin enzymes into retinoic acid, which boosts collagen and increases cell turnover for a smooth and ageless complexion. Essence, "Everything You Need To Know To Get The Skin You Want This Year," 20 Jan. 2020 This form of vitamin A is an antiaging MVP for its ability to renew skin-cell turnover and stimulate collagen production, leading to a decrease in wrinkles and breakouts alike. Glamour Beauty Editors, Glamour, "Shop All the Glamour Beauty Awards Readers’ Choice Skin-Care Nominees," 15 Jan. 2020 Young children who are malnourished, have vitamin A deficiency, or whose immune systems have been weakened by HIV/AIDS or other diseases are most susceptible to the disease, the World Health Organization said. Radina Gigova, CNN, "Measles has claimed more than twice as many lives as Ebola in DRC," 28 Nov. 2019 As Nails Vitamin Strength Serum Formulated with vitamins A, C and E, this fast-absorbing, non-sticky serum for your nails and cuticles helps prevent breakage. Kami Phillips,, "PEOPLE Beauty Awards: Best Makeup Products of 2019," 20 Nov. 2019 Low levels of vitamin A also contribute to deaths from infectious diseases such as measles. Erik Stokstad, Science | AAAS, "Bangladesh could be the first to cultivate golden rice, genetically altered to fight blindness," 20 Nov. 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.

See More

First Known Use of vitamin A

circa 1920, in the meaning defined above

Keep scrolling for more

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

Statistics for vitamin A

Last Updated

15 Feb 2020

Cite this Entry

“Vitamin A.” Dictionary, Merriam-Webster, Accessed 17 Feb. 2020.

Keep scrolling for more

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

Comments on vitamin A

What made you want to look up vitamin A? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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