: 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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Collagen-boosting peptides work over time to plump and smooth the appearance of wrinkles, hyaluronic acid hydrates and softens, and a protective cocktail of vitamins A, C, and E shields skin from daily environmental aggressors.
—
Jailynn Taylor, Allure, 13 June 2026
Young said another growing area of interest is hair health as early findings suggest copper peptides may help enlarge hair follicles, prolong the hair-growth cycle and improve scalp circulation, though such research is inconclusive and ongoing.
—Daryl Austin, USA Today, 13 June 2026
MedPage Today reported this week that at the annual meeting of the American Medical Association delegates urged the FDA to do a better job regulating unapproved peptides.
—Joshua P. Cohen, Forbes.com, 13 June 2026
People struggling with side effects should talk with their prescriber, not wait for a research peptide.
—Allison Palmer
updated June 13, Miami Herald, 13 June 2026
See All Example Sentences for peptide
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Jailynn Taylor, Allure, 13 June 2026
Young said another growing area of interest is hair health as early findings suggest copper peptides may help enlarge hair follicles, prolong the hair-growth cycle and improve scalp circulation, though such research is inconclusive and ongoing.
—Daryl Austin, USA Today, 13 June 2026
MedPage Today reported this week that at the annual meeting of the American Medical Association delegates urged the FDA to do a better job regulating unapproved peptides.
—Joshua P. Cohen, Forbes.com, 13 June 2026
People struggling with side effects should talk with their prescriber, not wait for a research peptide.
—Allison Palmer
updated June 13, Miami Herald, 13 June 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 17 Jun. 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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