Definition of lysine in English:

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Pronunciation: /ˈlīsēn/


A basic amino acid that is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates.
  • Chemical formula: NH2(CH2)4CH(NH2)COOH.
Example sentences
  • Hydroxyl radicals oxidize amino acids such as lysine, serine, arginine, and proline.
  • Arginine appears to counteract the hypercholesterolemic effect of the essential amino acids lysine and methionine.
  • The most prevalent amino acid is cysteine with other major ones including tyrosine, histidine, lysine and arginine.


Late 19th century: from German Lysin, based on lysis.

For editors and proofreaders

Syllabification: ly·sine

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