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

Pomegranate, watermelon, and rose extracts bring a touch of hydration, while vitamins A, C, and E help brighten and protect. —Jailynn Taylor, Allure, 3 July 2025

An average of 600,000 gifts (from chocolate to vitamins to cosmetics and clothes) are exchanged daily, the company says, in the form of mobile vouchers that can be redeemed at participating restaurants and retailers or ordered from the platform’s gift shop. —John Kang, Forbes.com, 3 July 2025

Foods that contain vitamin D While not many foods provide vitamin D3, a few do. —Leslie Baumann, Miami Herald, 3 July 2025

Each packet contains 80 milligrams of caffeine from green and black tea, plus antioxidants and vitamins A, C and E. Available now in three delicious flavors: Pomegranate Blueberry, Peach Mango and Strawberry Lemonade. —Adam Mills, MSNBC Newsweek, 2 July 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