: any of various amides that are derived from two or more amino acids by combination of the amino group of one acid with the carboxyl group of another and are usually obtained by partial hydrolysis of proteins
Examples of peptide in a Sentence
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The mascara is made with rich black pigments that define lashes in one fell swoop, plus nourishing peptides and shea butter to condition them at the same time.
—
Clara McMahon, PEOPLE, 13 Jan. 2026
This concentrated treatment pairs barrier-supporting peptides with deep hydrators like glycerin, sorbitol, and butylene glycol to smooth roughness and revive skin that feels tight or depleted in winter.
—Colleen Sullivan, InStyle, 10 Jan. 2026
Here, pea peptides, castor oil, and glycerin help to condition lash and brow hairs, improving overall density and preventing breakage.
—Kiana Murden, Vogue, 9 Jan. 2026
Experts say that a pill version of the high-demand medication, which is part of a category of drugs that are broadly known as a glucagonlike peptide 1 (GLP-1) receptor agonists, could significantly reduce access barriers.
—Lauren J. Young, Scientific American, 5 Jan. 2026
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Clara McMahon, PEOPLE, 13 Jan. 2026
This concentrated treatment pairs barrier-supporting peptides with deep hydrators like glycerin, sorbitol, and butylene glycol to smooth roughness and revive skin that feels tight or depleted in winter.
—Colleen Sullivan, InStyle, 10 Jan. 2026
Here, pea peptides, castor oil, and glycerin help to condition lash and brow hairs, improving overall density and preventing breakage.
—Kiana Murden, Vogue, 9 Jan. 2026
Experts say that a pill version of the high-demand medication, which is part of a category of drugs that are broadly known as a glucagonlike peptide 1 (GLP-1) receptor agonists, could significantly reduce access barriers.
—Lauren J. Young, Scientific American, 5 Jan. 2026
See All Example Sentences for peptide
Cite this Entry
“Peptide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peptide. Accessed 19 Jan. 2026.
Copy CitationKids Definition
peptide
noun
pep·tide
ˈpep-ˌtīd 
: any of various substances that are usually obtained by the partial breakdown of proteins
Medical Definition
peptide
noun
pep·tide
ˈpep-ˌtīd
: any of various amides that are derived from two or more amino acids by combination of the amino group of one acid with the carboxyl group of another and are usually obtained by partial hydrolysis of proteins
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