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
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People who have taken too much vitamin D, for example, have been taken to hospital with seizures, which, in some cases, have led to coma or death.
—
The Week Uk, TheWeek, 2 Jan. 2026
These minerals work together to aid the synthesis of vitamin D in your body.
—Brittany Lubeck, Verywell Health, 30 Dec. 2025
Experts say tea is unlikely to harm bone health, but exercise and calcium and vitamin D intake still matter most.
—Julia Ries Wexler, Health, 30 Dec. 2025
One of the main ingredients of hot chocolate is milk, which is known for providing calcium and vitamin D, essential for strong bones.
—Vanessa Etienne, PEOPLE, 25 Dec. 2025
See All Example Sentences for vitamin D
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The Week Uk, TheWeek, 2 Jan. 2026
These minerals work together to aid the synthesis of vitamin D in your body.
—Brittany Lubeck, Verywell Health, 30 Dec. 2025
Experts say tea is unlikely to harm bone health, but exercise and calcium and vitamin D intake still matter most.
—Julia Ries Wexler, Health, 30 Dec. 2025
One of the main ingredients of hot chocolate is milk, which is known for providing calcium and vitamin D, essential for strong bones.
—Vanessa Etienne, PEOPLE, 25 Dec. 2025
See All Example Sentences for vitamin D
Cite this Entry
“Vitamin D.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20D. Accessed 7 Jan. 2026.
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