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

These include vitamin C, vitamin D, zinc, elderberry, garlic, echinacea, and more. —Christopher Bergland, Verywell Health, 15 Jan. 2026

Researchers recommend consuming the mushrooms before the best-by date to get a vitamin D level above 10 micrograms per 100 grams. —Cynthia Sass, Health, 14 Jan. 2026

Healthy fats, fish oil, zinc, and vitamin D all make an appearance. —Theresa Gaffney, STAT, 12 Jan. 2026

People of all ages, including myself, have seen results with the Colorescience Barrier Pro Serum Spray, a hydrating mist that strengthens the skin barrier and promotes its natural production of vitamin D wherever it’s applied. —Emma Greene, InStyle, 10 Jan. 2026

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