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
With more than 100,000 supplements now on the market (up from about 3,000 when Ritual launched) and little regulatory oversight, many consumers have grown increasingly skeptical about what’s actually in their vitamins and capsules, even as interest in them soars.
—
Gabby Shacknai, Forbes.com, 30 July 2025
Treatments for osteoporosis include medications, vitamins, supplements, and lifestyle modifications, such as osteoporosis-friendly exercise and diet changes.
—Marissa Sansone, Verywell Health, 30 July 2025
Dietitians particularly love: Raspberries and other types of berries
Chia seeds
Avocados
Sweet potatoes with the skin
Broccoli
Beans
Almonds
Beyond fiber, these foods also contain other essential nutrients, like unsaturated fats, protein, vitamins, minerals, and antioxidants, Rifkin says.
—Emily Kay Votruba, EverydayHealth.com, 29 July 2025
Beets have been touted as one of nature's superfoods, rich in a range of vitamins and nutrients, and shown promise in benefiting people with high blood pressure.
—New Atlas, 27 July 2025
See All Example Sentences for vitamin
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Gabby Shacknai, Forbes.com, 30 July 2025
Treatments for osteoporosis include medications, vitamins, supplements, and lifestyle modifications, such as osteoporosis-friendly exercise and diet changes.
—Marissa Sansone, Verywell Health, 30 July 2025
Dietitians particularly love: Raspberries and other types of berries
Chia seeds
Avocados
Sweet potatoes with the skin
Broccoli
Beans
Almonds
Beyond fiber, these foods also contain other essential nutrients, like unsaturated fats, protein, vitamins, minerals, and antioxidants, Rifkin says.
—Emily Kay Votruba, EverydayHealth.com, 29 July 2025
Beets have been touted as one of nature's superfoods, rich in a range of vitamins and nutrients, and shown promise in benefiting people with high blood pressure.
—New Atlas, 27 July 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 7 Aug. 2025.
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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