: 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
Recent Examples on the Web
The first test paired the nanoparticle system with melanoma peptides called an antigen, which triggers an immune response.
—
Hannah Millington, MSNBC Newsweek, 10 Oct. 2025
Say, more traditional prescriptions with over-the-counter supplements, as well as more experimental treatments like exosomes and peptides.
—Helen Carefoot, Flow Space, 9 Oct. 2025
When combined with multiple peptides, 100% of vaccinated mice rejected tumors, while all untreated or single-adjuvant groups died within a month.
—New Atlas, 9 Oct. 2025
Available in eight modern shades, from a rich chocolate to a mauve-y pink, these complement any makeup look while reversing dryness via peptides, ceramides, and PGA.
—Conçetta Ciarlo, Vogue, 8 Oct. 2025
See All Example Sentences for peptide
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Hannah Millington, MSNBC Newsweek, 10 Oct. 2025
Say, more traditional prescriptions with over-the-counter supplements, as well as more experimental treatments like exosomes and peptides.
—Helen Carefoot, Flow Space, 9 Oct. 2025
When combined with multiple peptides, 100% of vaccinated mice rejected tumors, while all untreated or single-adjuvant groups died within a month.
—New Atlas, 9 Oct. 2025
Available in eight modern shades, from a rich chocolate to a mauve-y pink, these complement any makeup look while reversing dryness via peptides, ceramides, and PGA.
—Conçetta Ciarlo, Vogue, 8 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 20 Oct. 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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