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

While Monaghan is all about the vitamin D exposure and taking on adventurous roles, a big part of her wellness routine is vigilance about sun care, due to a past melanoma diagnosis. — Mara Santilli, Flow Space, 2 July 2026

While a vitamin D deficiency is associated with a higher risk of fibroids, researchers cannot definitively say that the deficiency causes fibroids. — Sukhman Rekhi, Verywell Health, 1 July 2026

Eating vitamin D-rich foods can help improve calcium absorption in the gut and its deposition into bones. — Emmanuella Ogbonna, Health, 30 June 2026

Every plate contains high-quality protein to support muscle repair and recovery, carbohydrates to replenish energy stores, as well as omega-3 fatty acids, vitamin D, calcium, iron and magnesium. — Jordan Campbell, New York Times, 29 June 2026

Word History

First Known Use

circa 1921, in the meaning defined above

Rhymes for vitamin D

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

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