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

Though rare, vitamin D toxicity can occur because your body stores it rather than getting rid of any excess.5 Too much vitamin D in your blood may cause problems like high calcium levels, kidney failure, heart arrhythmias, and even death, according to Hernandez. —Sherri Gordon, Health, 1 July 2025

These antiperspirant sticks are infused with vitamin E, Magnesium and vitamin D, all of which promote healthier skin. —Christopher Murray May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 30 June 2025

The skin makes most of the body's vitamin D from exposure to sunlight, but it is also found in certain foods. —Aubrey Bailey, Verywell Health, 18 June 2025

Mushrooms Orange juice Sun exposure also raises vitamin D in the body. —Tom Gavin, EverydayHealth.com, 27 May 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