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

Other options include taking vitamin supplements and making lifestyle changes such as quitting smoking, losing weight and regular exercise, which may be easier options for women in low-income settings. —Sashikala Vp, CNN Money, 4 Dec. 2025

But like perfumes, medicine and vitamins are sensitive to heat and humidity and should be kept out of the bathroom entirely. —Mary Cornetta, Better Homes & Gardens, 4 Dec. 2025

Spinach is good for eye health and one of the best sources of vitamin K, a nutrient that supports strong bones. —Kelly Burch Published, Verywell Health, 4 Dec. 2025

Immunity Support Lemon juice is a rich source of vitamin C, a powerful antioxidant. —Laura Schober, Health, 4 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