: a crystalline essential amino acid C6H14N2O2 obtained from the hydrolysis of various proteins
Examples of lysine in a Sentence
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Regardless, this cheese is a complete milk protein and has a particularly high concentration of lysine, an essential amino acid necessary for building muscles, as well as calcium to support strong bones.
—
Philipp Wehsack, Vogue, 28 Mar. 2026
These amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine – collectively necessary for building muscle, producing enzymes and hormones and maintaining healthy tissue.
—Daryl Austin, USA Today, 21 Mar. 2026
Other grains are low in one or more amino acids, most commonly lysine.
—Merve Ceylan, Health, 21 Feb. 2026
The amino acids required for collagen synthesis, particularly glycine, proline, and lysine, are readily available from a wide range of foods including eggs, fish, poultry, dairy products, legumes, soy foods and meat.
—Leeann Weintraub, Daily News, 5 Feb. 2026
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Philipp Wehsack, Vogue, 28 Mar. 2026
These amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine – collectively necessary for building muscle, producing enzymes and hormones and maintaining healthy tissue.
—Daryl Austin, USA Today, 21 Mar. 2026
Other grains are low in one or more amino acids, most commonly lysine.
—Merve Ceylan, Health, 21 Feb. 2026
The amino acids required for collagen synthesis, particularly glycine, proline, and lysine, are readily available from a wide range of foods including eggs, fish, poultry, dairy products, legumes, soy foods and meat.
—Leeann Weintraub, Daily News, 5 Feb. 2026
See All Example Sentences for lysine
Cite this Entry
“Lysine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lysine. Accessed 2 Apr. 2026.
Copy CitationKids Definition
lysine
noun
ly·sine
ˈlī-ˌsēn 
: an essential amino acid obtained from various proteins
Medical Definition
lysine
noun
ly·sine
ˈlī-ˌsēn
: a crystalline essential amino acid C6H14N2O2 obtained from the hydrolysis of various proteins
—abbreviation Lys
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