histidine

noun

his·​ti·​dine ˈhi-stə-ˌdēn How to pronounce histidine (audio)
: a crystalline essential amino acid C6H9N3O2 formed by the hydrolysis of most proteins

Examples of histidine in a Sentence

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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.
High-quality protein is any protein that contains all of the nine essential amino acids (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine) that our bodies don’t make on their own. — USA TODAY, 2 July 2023 This supplement also contains 100% of your daily value of folate, 3,000 percent of your daily value of B12, and the amino acid L-histidine. — Tamar Kane, Verywell Health, 5 Feb. 2023

Word History

Etymology

International Scientific Vocabulary hist- + -idine

First Known Use

1896, in the meaning defined above

Time Traveler
The first known use of histidine was in 1896

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“Histidine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/histidine. Accessed 25 Mar. 2025.

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Medical Definition

histidine

noun
his·​ti·​dine ˈhis-tə-ˌdēn How to pronounce histidine (audio)
: a crystalline essential amino acid C6H9N3O2 formed by the hydrolysis of most proteins
—abbreviation His

More from Merriam-Webster on histidine

Britannica.com: Encyclopedia article about histidine

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