Definition of lysine in English:


Syllabification: ly·sine
Pronunciation: /ˈlīˌsēn


  • 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
    More 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.

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Pronunciation: skōSH
a small amount; a little