plural vitamins
1
: a natural substance that is usually found in foods and that helps your body to be healthy
This cereal contains essential vitamins and minerals.
vitamin pills
Note: Most vitamins are named by letters.
2
: a pill containing vitamins
Did you remember to take your vitamin?
Cite this Entry
“Vitamin.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/vitamin. Accessed 19 Apr. 2026.
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