methionine
noun
me·thi·o·nine mə-ˈthī-ə-ˌnēn 
: a crystalline sulfur-containing essential amino acid C5H11NO2S that occurs in the levorotatory form as a constituent of many proteins
Example Sentences
Recent Examples on the Web Made from split peas, pea protein ($19, Amazon) contains all of the essential amino acids, but is low in one—methionine. 
Brierley Horton, Ms, Better Homes & Gardens, 15 Aug. 2022 Evonik, in the governor’s news release, said the investment aligns with the division’s sustainability strategy by reducing the carbon footprint of DL-methionine from Mobile by about 7%. John Sharp | Jsharp@al.com, al, 23 Feb. 2022 These essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenyalinine, threonine, tryptophan and valine. Alyssa Jung, Good Housekeeping, 5 Oct. 2021 Limiting the essential amino acid methionine appears to amplify the effects of radiation and chemotherapy in mice with colon cancer and sarcomas. Jocelyn Kaiser, Science | AAAS, 1 Apr. 2021 Made from split peas, pea protein ($15, Amazon) contains all of the essential amino acids, but is low in one—methionine. Brierley Horton, Ms, Better Homes & Gardens, 26 Feb. 2021 The culprit is methionine, an amino acid that contains sulfur. Esther Mobley, SFChronicle.com, 7 May 2020 In the search for another path to the fountain of youth, researchers have been exploring the role of methionine and cysteine, two of the body's nine essential amino acids which contain sulfur. Sandee Lamotte, CNN, 3 Feb. 2020 In one early study of rats, limiting methionine by 80% increased the rats' lifespans by an average of 43%. Sandee Lamotte, CNN, 3 Feb. 2020 See More
Brierley Horton, Ms, Better Homes & Gardens, 15 Aug. 2022 Evonik, in the governor’s news release, said the investment aligns with the division’s sustainability strategy by reducing the carbon footprint of DL-methionine from Mobile by about 7%. John Sharp | Jsharp@al.com, al, 23 Feb. 2022 These essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenyalinine, threonine, tryptophan and valine. Alyssa Jung, Good Housekeeping, 5 Oct. 2021 Limiting the essential amino acid methionine appears to amplify the effects of radiation and chemotherapy in mice with colon cancer and sarcomas. Jocelyn Kaiser, Science | AAAS, 1 Apr. 2021 Made from split peas, pea protein ($15, Amazon) contains all of the essential amino acids, but is low in one—methionine. Brierley Horton, Ms, Better Homes & Gardens, 26 Feb. 2021 The culprit is methionine, an amino acid that contains sulfur. Esther Mobley, SFChronicle.com, 7 May 2020 In the search for another path to the fountain of youth, researchers have been exploring the role of methionine and cysteine, two of the body's nine essential amino acids which contain sulfur. Sandee Lamotte, CNN, 3 Feb. 2020 In one early study of rats, limiting methionine by 80% increased the rats' lifespans by an average of 43%. Sandee Lamotte, CNN, 3 Feb. 2020 See More Word History
Etymology
International Scientific Vocabulary, from methyl + thion- + -ine entry 2
First Known Use
1928, in the meaning defined above
Medical Definition
methionine
noun
me·thi·o·nine mə-ˈthī-ə-ˌnēn
: 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