: a crystalline essential amino acid C6H14N2O2 obtained from the hydrolysis of various proteins
Examples of lysine in a Sentence
Recent Examples on the Web
While quinoa is a complete protein, many grains are lower in lysine, an amino acid that is more abundant in legumes, dairy, eggs, and animal proteins.
—
Lynn Andriani, Martha Stewart, 30 May 2026
The other six essential amino acids required to build and repair muscle are histidine, lysine, methionine, phenylalanine, threonine, and tryptophan.
—Shimite Obialo, Forbes.com, 26 May 2026
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
See All Example Sentences for lysine
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Lynn Andriani, Martha Stewart, 30 May 2026
The other six essential amino acids required to build and repair muscle are histidine, lysine, methionine, phenylalanine, threonine, and tryptophan.
—Shimite Obialo, Forbes.com, 26 May 2026
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
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 Jun. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
