vitamin D

noun

: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: such as
a
or vitamin D2 : calciferol
b

Examples of vitamin D 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.
Getting an adequate supply of vitamin D may help balance your body’s production and response to dopamine.13 Sunlight exposure is one of the most efficient ways for your body to produce vitamin D. In addition to its impact on vitamin D, sunlight is known to improve mood for most people. Heidi Moawad, Verywell Health, 6 June 2025 Maitake mushrooms are a great source of vitamin D, and incorporate Shiitake into your diet for vitamin B6. Boutayna Chokrane, Wired News, 28 May 2025 The research team emphasized that more work is needed to determine how vitamin D impacts aging in different populations and whether these effects endure over longer timeframes. Reem Amro, FOXNews.com, 26 May 2025 High vitamin D levels can also cause your kidneys and heart to stop working properly. Health, 20 May 2025 See All Example Sentences for vitamin D

Word History

First Known Use

circa 1921, in the meaning defined above

Time Traveler
The first known use of vitamin D was circa 1921

Browse Nearby Words

Cite this Entry

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

Kids Definition

vitamin D

noun
: any of several vitamins that are needed for normal bone and tooth structure, and are found especially in fish-liver oils, egg yolk, and milk or are produced in response to ultraviolet light

Medical Definition

vitamin D

noun
: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: as
b
: cholecalciferol

called also sunshine vitamin

More from Merriam-Webster on vitamin D

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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