cysteine

noun
cys·​te·​ine | \ ˈsi-stə-ˌēn How to pronounce cysteine (audio) \

Definition of cysteine

: a crystalline sulfur-containing amino acid C3H7NO2S readily oxidizable to cystine

Examples of cysteine in a Sentence

Recent Examples on the Web The new treatment is an inexpensive, over-the-counter supplement called N-acetyl cysteine, or NAC, that is widely available. Cezary Podkul, WSJ, 28 Dec. 2020 The researchers received funding from Catapult Cat Oy, which sells the L-cysteine supplements. Andrew Stuttaford, National Review, 20 Aug. 2020 The subjects were then asked to swallow placebo or L-cysteine tablets containing vitamin supplements. BostonGlobe.com, 19 Aug. 2020 The researchers received funding from Catapult Cat Oy, which sells the L-cysteine supplements. Andrew Stuttaford, National Review, 20 Aug. 2020 The researchers received funding from Catapult Cat Oy, which sells the L-cysteine supplements. Andrew Stuttaford, National Review, 20 Aug. 2020 The researchers received funding from Catapult Cat Oy, which sells the L-cysteine supplements. Andrew Stuttaford, National Review, 20 Aug. 2020 That amino acid is supposed to be cysteine, and has been in all humans examined to this point. Mark Johnson And Kathleen Gallagher, Milwaukee Journal Sentinel, 21 Dec. 2010 The researchers received funding from Catapult Cat Oy, which sells the L-cysteine supplements. Andrew Stuttaford, National Review, 20 Aug. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cysteine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cysteine

1884, in the meaning defined above

History and Etymology for cysteine

International Scientific Vocabulary, from cystine + -ein

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Time Traveler for cysteine

Time Traveler

The first known use of cysteine was in 1884

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Dictionary Entries Near cysteine

cysteamine

cysteine

cystic

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Statistics for cysteine

Cite this Entry

“Cysteine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cysteine. Accessed 24 Oct. 2021.

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More Definitions for cysteine

cysteine

noun
cys·​teine | \ ˈsis-tə-ˌēn How to pronounce cysteine (audio) \

Medical Definition of cysteine

: a sulfur-containing amino acid C3H7NO2S occurring in many proteins and glutathione and readily oxidizable to cystine abbreviation Cys

More from Merriam-Webster on cysteine

Britannica English: Translation of cysteine for Arabic Speakers

Britannica.com: Encyclopedia article about cysteine

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