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.
What’s more, these fish are also naturally abundant in vitamin D, which helps your body absorb that mineral! Caroline Tien, SELF, 19 Feb. 2025 The sun converts cholesterol in our skin into vitamin D, which provides several benefits. Allison Futterman, Discover Magazine, 13 Feb. 2025 Alongside calcium and vitamin D, protein supports bone density and helps reduce the risk of osteoporosis. Emily Cegielski, Flow Space, 12 Feb. 2025 Choose Foods Rich in Calcium and Vitamin D Individuals taking aromatase inhibitors to treat breast cancer should also increase their intake of calcium and vitamin D since bone loss is a side effect of these medications. Brittany Poulson, Mda, Rdn, Cd, Cdces, Verywell Health, 11 Feb. 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

Dictionary Entries Near vitamin D

Cite this Entry

“Vitamin D.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20D. Accessed 23 Feb. 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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