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 cow's milk is high in protein and other nutrients like calcium and vitamin D, consider opting for a high-protein plant milk to get nearly the same amount of protein without the lactose. —Cristina Mutchler, Verywell Health, 19 May 2026

Removing dairy without replacements can lower intake of calcium, vitamin D, and protein, which are important for bone health and overall nutrition. —Jillian Kubala, Health, 14 May 2026

Creatine is among the most consistently supported across age groups and genders, and a 2025 PMC nutrition and sarcopenia review also points to vitamin D and omega-3 fatty acids as useful supporting tools. —Allison Palmer, Sacbee.com, 6 May 2026

The core stack the research keeps pointing to is straightforward: creatine, vitamin D and omega-3s, alongside adequate protein and twice-weekly resistance training. —Allison Palmer, Charlotte Observer, 6 May 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