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
Your body needs vitamin D to absorb calcium and maintain bone strength.
—
Zia Sherrell, Health, 5 Feb. 2026
Along with calcium and vitamin D, this important vitamin keeps bones healthy and strong.
—Julie Marks, Verywell Health, 4 Feb. 2026
In kids, vitamin D is essential for preventing rickets, a bone-softening disease.
—Stacey Colino, Time, 30 Jan. 2026
Meanwhile, fatigue and depression can both stem from a wide range of underlying health issues: anemia, thyroid malfunction, and vitamin D deficiency, to name a few.
—Caroline Tien, SELF, 26 Jan. 2026
See All Example Sentences for vitamin D
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.
Zia Sherrell, Health, 5 Feb. 2026
Along with calcium and vitamin D, this important vitamin keeps bones healthy and strong.
—Julie Marks, Verywell Health, 4 Feb. 2026
In kids, vitamin D is essential for preventing rickets, a bone-softening disease.
—Stacey Colino, Time, 30 Jan. 2026
Meanwhile, fatigue and depression can both stem from a wide range of underlying health issues: anemia, thyroid malfunction, and vitamin D deficiency, to name a few.
—Caroline Tien, SELF, 26 Jan. 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 7 Feb. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
