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

Some of the vitamins and minerals include vitamin D, vitamin C, vitamin E, B6, B12 and zinc. — Pubsubhub User, Chicago Tribune, 5 Aug. 2026

Nutritional deficiencies, such as low levels of vitamin D, calcium, or magnesium, can weaken teeth and gums, leading to sensitivity. — Julie Marks, Verywell Health, 5 Aug. 2026

Many foods provide omega-3 fatty acids, protein, vitamin D, and calcium that can support your heart as part of a balanced diet. — Lindsey Desoto, HEALTH, 5 Aug. 2026

Adequate protein also matters, as do iron, zinc and vitamin D; these are commonly depleted when caloric intake drops sharply, which independently can lead to shedding. — Jesse Pines, Forbes.com, 4 Aug. 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