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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Calcium and vitamin D are widely considered the foundation of bone health and remain central to treatment plans that don’t involve medication.
—
Hadia Zainab, CNN Money, 2 Apr. 2026
Compared to those with low vitamin D levels, participants with high vitamin D levels had less tau buildup in their fifties, including in regions of the brain where this protein tends to accumulate first in individuals who develop dementia, the study found.
—Emily Kay Votruba, EverydayHealth.com, 1 Apr. 2026
Both can impact metabolism of vitamin D, minimizing your ability to absorb calcium from food.
—Erica Sloan, SELF, 31 Mar. 2026
Deprived of the Sun, Australians acquire afflictions more commonly associated with northern Scandinavia, like vitamin D deficiencies and seasonal affective disorder, only all year-round.
—Big Think, 31 Mar. 2026
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Hadia Zainab, CNN Money, 2 Apr. 2026
Compared to those with low vitamin D levels, participants with high vitamin D levels had less tau buildup in their fifties, including in regions of the brain where this protein tends to accumulate first in individuals who develop dementia, the study found.
—Emily Kay Votruba, EverydayHealth.com, 1 Apr. 2026
Both can impact metabolism of vitamin D, minimizing your ability to absorb calcium from food.
—Erica Sloan, SELF, 31 Mar. 2026
Deprived of the Sun, Australians acquire afflictions more commonly associated with northern Scandinavia, like vitamin D deficiencies and seasonal affective disorder, only all year-round.
—Big Think, 31 Mar. 2026
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 3 Apr. 2026.
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