: 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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Whole wheat bread provides more fiber and nutrients than white bread, but doesn’t undergo the same fermentation that produces peptides and GABA.
—
Morgan Pearson, Verywell Health, 24 Oct. 2025
And this peptide serum delivers, with 10 different peptides (which serve to smooth lines and plump lax skin) housed in yet another copper peptide that delivers them deep into the skin.
—Deanna Pai, Vogue, 22 Oct. 2025
About 43% of employers with 5,000 or more workers covered glucagon-like peptide 1, or GLP-1, medications for weight loss.
—Ken Alltucker, USA Today, 22 Oct. 2025
For example, the brand had to reissue and had to rebrand its peptide lip treatment after customers complained about the texture.
—Jessica Coacci, Fortune, 17 Oct. 2025
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Morgan Pearson, Verywell Health, 24 Oct. 2025
And this peptide serum delivers, with 10 different peptides (which serve to smooth lines and plump lax skin) housed in yet another copper peptide that delivers them deep into the skin.
—Deanna Pai, Vogue, 22 Oct. 2025
About 43% of employers with 5,000 or more workers covered glucagon-like peptide 1, or GLP-1, medications for weight loss.
—Ken Alltucker, USA Today, 22 Oct. 2025
For example, the brand had to reissue and had to rebrand its peptide lip treatment after customers complained about the texture.
—Jessica Coacci, Fortune, 17 Oct. 2025
See All Example Sentences for peptide
Cite this Entry
“Peptide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peptide. Accessed 1 Nov. 2025.
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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