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

-ˈdē-ˈtü 

: calciferol

b

or vitamin D₃

-ˈdē-ˈthrē 

: cholecalciferol

Examples of vitamin D in a Sentence

Recent Examples on the Web

Studies have shown that vitamin D supplementation may improve fatigue in otherwise healthy individuals with a vitamin D deficiency.8 Vitamin D Sources Your body makes vitamin D when it’s exposed directly to sunlight. —Jonathan Purtell, Verywell Health, 28 Feb. 2025

Unlike with vitamin D, there’s evidence that magnesium supplementation could help control blood glucose, says Bridges. —Tom Gavin, EverydayHealth.com, 29 Jan. 2025

Adding eggs to a salad or sandwich can provide an easy vitamin D boost. —Christine Rousselle, Fox News, 24 Jan. 2025

In fact, taking too much vitamin D can actually negatively impact your health. —Ariana Yaptangco, Glamour, 16 Jan. 2025

Word History

First Known Use

circa 1921, in the meaning defined above

Rhymes for vitamin D

• abc
• absentee
• addressee
• adoptee
• agouti
• allottee
• amphorae
• amputee
• apc
• apogee
• appointee
• assessee

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

: calciferol

b

: cholecalciferol

called also sunshine vitamin