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

Chronic inflammation, high sugar intake, aging and low calcium and vitamin D can all interfere with that bone remodeling cycle, studies have shown. —Deirdre Bardolf, FOXNews.com, 12 Dec. 2025

In addition to protein, salmon also provides heart-healthy omega-3 fatty acids, and other essential nutrients like vitamin D, vitamin B12, and selenium. —Jillian Kubala, Health, 12 Dec. 2025

Since vitamin D is a fat-soluble vitamin, it can be stored in the body and build up over time. —Mira Miller, Verywell Health, 12 Dec. 2025

Three surviving siblings, ages 2, 4 and 5 at the time, were subsequently hospitalized with rickets, osteopenia, vitamin D deficiency and significant developmental delays, court records show. —Charles Trepany, USA Today, 10 Dec. 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