methionine

noun

me·​thi·​o·​nine mə-ˈthī-ə-ˌnēn How to pronounce methionine (audio)
: a crystalline sulfur-containing essential amino acid C5H11NO2S that occurs in the levorotatory form as a constituent of many proteins

Examples of methionine 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.
It is made up of three main amino acids—glycine, arginine, and methionine. Jillian Kubala, Health, 12 Aug. 2024 What is Creatine? Creatine is made from three amino acids: glycine, arginine, and methionine. Staff Author, Health, 6 Aug. 2024 Your body makes creatine from three amino acids: arginine, glycine, and methionine. Elizabeth Barnes, Verywell Health, 6 Aug. 2024 Another food that can affect urine odor is broccoli, which Savage says is metabolized in similar fashion to asparagus, including the excretion of methionine and its related sulfur smell. Daryl Austin, USA TODAY, 14 July 2024 See all Example Sentences for methionine 

Word History

Etymology

International Scientific Vocabulary, from methyl + thion- + -ine entry 2

First Known Use

1928, in the meaning defined above

Time Traveler
The first known use of methionine was in 1928

Dictionary Entries Near methionine

Cite this Entry

“Methionine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/methionine. Accessed 22 Nov. 2024.

Medical Definition

methionine

noun
me·​thi·​o·​nine mə-ˈthī-ə-ˌnēn How to pronounce methionine (audio)
: a crystalline sulfur-containing essential amino acid C5H11NO2S that occurs in the L-form as a constituent of many proteins (as casein and egg albumin), that is important especially as a source of sulfur for the biosynthesis of cysteine and as a source of methyl groups for transmethylation reactions (as in the biosynthesis of choline, creatine, and adrenaline), and that is used as a dietary supplement for human beings and their domestic mammals and poultry and in the treatment of fatty infiltration of the liver
abbreviation Met

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