vitamin

noun

vi·​ta·​min ˈvī-tə-mən 

British usually

ˈvi- 

: any of various organic substances that are essential in minute quantities to the nutrition of most animals and some plants, act especially as coenzymes and precursors of coenzymes in the regulation of metabolic processes but do not provide energy or serve as building units, and are present in natural foodstuffs or sometimes produced within the body

Examples of vitamin in a Sentence

This cereal contains essential vitamins and minerals.

Did you remember to take your vitamin?

Recent Examples on the Web

Berries are low in calories but rich in vitamins, antioxidants, and fiber, which can support overall health. —Chelsea Rae Bourgeois, Health, 25 Dec. 2025

Skincare packed with vitamins is another option — like Dermalogica Biolumin-C Night Restore Serum with Pro-Vitamin D Complex, which brightens and strengthens the skin barrier overnight. —Jacqueline Kilikita, Refinery29, 24 Dec. 2025

Carve out a small corner in your kitchen to set up a coffee barand keep reusable water bottles, vitamins, and breakfast supplies nearby. —Mary Cornetta, Better Homes & Gardens, 23 Dec. 2025

Taking high doses of vitamin B3 for cholesterol should be approved and monitored by a healthcare provider. —Patty Weasler, Verywell Health, 23 Dec. 2025

Word History

Etymology

alteration of vitamine, from Latin vita life + English amine

First Known Use

circa 1912, in the meaning defined above

Phrases Containing vitamin

• B vitamin
• vitamin A
• vitamin B6
• vitamin B complex
• vitamin C
• vitamin D3
• vitamin E
• vitamin H
• vitamin K3

Kids Definition

vitamin

noun

vi·​ta·​min ˈvīt-ə-mən 

: any of various substances that are necessary in very small amounts to the nutrition of most animals and some plants, that are important to the control of growth and development by activating and assisting in the function of enzymes, and that are present naturally in many foods or in some cases are produced within the body

Medical Definition

vitamin

noun

vi·​ta·​min ˈvīt-ə-mən, British also ˈvit- 

: any of various organic substances that are essential in minute quantities to the nutrition of most animals and some plants, act especially as coenzymes and precursors of coenzymes in the regulation of metabolic processes but do not provide energy or serve as building units, and are present in natural foodstuffs or are sometimes produced within the body