ornithine

noun

or·​ni·​thine ˈȯr-nə-ˌthēn How to pronounce ornithine (audio)
: a crystalline amino acid C5H12N2O2 that functions especially in urea production as a carrier by undergoing conversion to citrulline and then arginine in reaction with ammonia and carbon dioxide followed by recovery along with urea by enzymatic hydrolysis of arginine

Examples of ornithine in a Sentence

Recent Examples on the Web On September 14, he was injected with the treatment, a normal ornithine transcarbamylase gene that the researchers had encased in an attenuated cold virus. Doug Johnson, Ars Technica, 5 Jan. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ornithine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

International Scientific Vocabulary ornithuric acid (a compound of which ornithine is a component, found in the urine of birds) + -ine entry 2

First Known Use

1878, in the meaning defined above

Time Traveler
The first known use of ornithine was in 1878

Dictionary Entries Near ornithine

Cite this Entry

“Ornithine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ornithine. Accessed 21 Jul. 2024.

Medical Definition

ornithine

noun
or·​ni·​thine ˈȯr-nə-ˌthēn How to pronounce ornithine (audio)
: a crystalline amino acid C5H12N2O2 that functions especially in urea production as a carrier by undergoing conversion to citrulline and then arginine in reaction with ammonia and carbon dioxide followed by recovery along with urea by enzymatic hydrolysis of arginine

More from Merriam-Webster on ornithine

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