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

Older adults who are both low in vitamin D and have high blood pressure may benefit the most. —Morgan Pearson, Verywell Health, 14 Nov. 2025

Supplements like omega-3s, vitamin D, probiotics, carbohydrate powders, electrolytes, and green powders are generally safe to consume with your protein shake and won’t interfere with absorption, said Larson. —Currie Engel, Health, 13 Nov. 2025

Normal vitamin D values have been shown to decrease coronary artery disease, heart failure and stroke. —Angelica Stabile, FOXNews.com, 12 Nov. 2025

However, the study notes that individuals following those diets might require supplemental vitamin D, iodine, and vitamin B12. —Simmone Shah, Time, 12 Nov. 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