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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
or vitamin D3
: cholecalciferol
Examples of vitamin D in a Sentence
Recent Examples on the Web
Studies have shown that vitamin D supplements can help to improve bone health, brain health and immune function, among other benefits.
DHEA (dehydroepiandrosterone), a hormone produced in the adrenal gland, is another of his top picks.
—Melissa Rudy, Fox News, 20 Nov. 2024
Statin medications may lower vitamin D levels, and supplementing with vitamin D may negatively impact the medication’s effects.
—Amy Brownstein, Ms, Rdn, Verywell Health, 31 Oct. 2024
Keeping your vitamin D levels healthy is also important.
—Lauryn Higgins, Flow Space, 30 Oct. 2024
Some people also take supplements like elderberry, vitamin C, vitamin D, or zinc to boost their immunity and help prevent illness.1112
While the cold and flu share many preventative measures, only the flu has a vaccine for treatment and prevention.
—Brandi Jones, Msn-Ed, Health, 30 Oct. 2024
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Word History
First Known Use
circa 1921, in the meaning defined above
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 1 Dec. 2024.
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
a
b
: cholecalciferol
called also sunshine vitamin
More from Merriam-Webster on vitamin D
Britannica.com: Encyclopedia article about vitamin D
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