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

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Though rare, vitamin D toxicity can occur because your body stores it rather than getting rid of any excess.5 Too much vitamin D in your blood may cause problems like high calcium levels, kidney failure, heart arrhythmias, and even death, according to Hernandez. Sherri Gordon, Health, 1 July 2025 These antiperspirant sticks are infused with vitamin E, Magnesium and vitamin D, all of which promote healthier skin. Christopher Murray May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 30 June 2025 The skin makes most of the body's vitamin D from exposure to sunlight, but it is also found in certain foods. Aubrey Bailey, Verywell Health, 18 June 2025 Mushrooms Orange juice Sun exposure also raises vitamin D in the body. Tom Gavin, EverydayHealth.com, 27 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

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Cite this Entry

“Vitamin D.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20D. Accessed 9 Jul. 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

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