vitamin C

noun

: a water-soluble vitamin C6H8O6 found in plants and especially in fruits and leafy vegetables or made synthetically and used in the prevention and treatment of scurvy and as an antioxidant for foods

called also ascorbic acid

Examples of vitamin C in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
And huge doses of vitamin C (once erroneously thought to stave off colds) can stomach upset, diarrhoea and, in extreme cases, kidney stones. The Week Uk, TheWeek, 2 Jan. 2026 The study is the first to show that vitamin C delivered through the bloodstream makes its way into all layers of the skin and is associated with measurable improvements in skin function, according to Vissers. Deirdre Bardolf, FOXNews.com, 2 Jan. 2026 At SweatHouz, also known as SWTHZ, services offered include infrared sauna, cold plunge and vitamin C showers, all in a private suite. Heidi Finley, Charlotte Observer, 2 Jan. 2026 What sets this formula apart is the inclusion of ascorbyl glucoside and niacinamide, a vitamin C derivative and brightening staple that improves the look of uneven tone and dark spots over time. Jailynn Taylor, Allure, 1 Jan. 2026 See All Example Sentences for vitamin C

Word History

First Known Use

circa 1920, in the meaning defined above

Time Traveler
The first known use of vitamin C was circa 1920

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Cite this Entry

“Vitamin C.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20C. Accessed 6 Jan. 2026.

Kids Definition

vitamin C

noun
: a vitamin that is present especially in citrus fruits, tomatoes, and green vegetables and is needed by the body to prevent scurvy

called also ascorbic acid

Medical Definition

vitamin C

noun
: a water-soluble vitamin C6H8O6 found in plants and especially in fruits and leafy vegetables or made synthetically and used in the prevention and treatment of scurvy and as an antioxidant for foods

called also ascorbic acid

More from Merriam-Webster on vitamin C

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