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
Healthy adults should aim for about 250 milligrams of vitamin C per day to maintain adequate levels in the blood plasma — the liquid portion of the blood that carries nutrients throughout the body — the researchers said.
—
Deirdre Bardolf, FOXNews.com, 2 Jan. 2026
Cruciferous vegetables like Brussels sprouts, broccoli, cauliflower, cabbage, kale and arugula are chockfull of vitamins and minerals that support overall health.
—Helen Carefoot, Flow Space, 1 Jan. 2026
In this recipe, winter citrus and root vegetables join forces to make a vibrant drinkable breakfast packed with essential vitamins and minerals.
—Riley Wofford, Martha Stewart, 31 Dec. 2025
Increases Your Antioxidant Levels Hibiscus tea is a rich source of antioxidants like vitamin C, carotenoids, and anthocyanins.
—Jillian Kubala, Health, 31 Dec. 2025
See All Example Sentences for vitamin
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Deirdre Bardolf, FOXNews.com, 2 Jan. 2026
Cruciferous vegetables like Brussels sprouts, broccoli, cauliflower, cabbage, kale and arugula are chockfull of vitamins and minerals that support overall health.
—Helen Carefoot, Flow Space, 1 Jan. 2026
In this recipe, winter citrus and root vegetables join forces to make a vibrant drinkable breakfast packed with essential vitamins and minerals.
—Riley Wofford, Martha Stewart, 31 Dec. 2025
Increases Your Antioxidant Levels Hibiscus tea is a rich source of antioxidants like vitamin C, carotenoids, and anthocyanins.
—Jillian Kubala, Health, 31 Dec. 2025
See All Example Sentences for vitamin
Cite this Entry
“Vitamin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin. Accessed 5 Jan. 2026.
Copy CitationKids 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
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