One of the mysteries of the English language finally explained.
A sulfur-containing amino acid that is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates.
- ‘They fix nitrogen and so contain high quality protein, including the essential amino acids methionine and cystine.’
- ‘Homocysteine is an intermediary metabolite of essential dietary amino acid methionine.’
- ‘The oxidation sites of alpha-crystallin are considered to be methionine, cysteine and tryptophan amino acid residues.’
- ‘Contents of glutamine, asparagine, methionine, and tryptophan in the tissues were not determined by this method.’
- ‘For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine.’
1920s: from methyl + Greek theion ‘sulfur’.
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