: 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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Critical to the body, peptides may play a role in hormone production, immune response, muscle growth, skin health and brain activity.
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Sandee Lamotte, CNN Money, 31 Jan. 2026
Hyaluronic acid, peptides, and botanical extracts provide pore-minimizing, firming, and line-smoothing properties.
—Tamim Alnuweiri, InStyle, 31 Jan. 2026
Cetaphil’s face serum uses purified peptides to improve your skin’s elasticity and reduce the appearance of lines.
—Lauren Taylor, Southern Living, 30 Jan. 2026
Brezavscek points barrier-supportive formulas, such as fatty acids, peptides, ceramides, hyaluronic acid, and niacinamide are key to soothe skin and restore its lipid balance.
—Kiana Murden, Vogue, 29 Jan. 2026
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Sandee Lamotte, CNN Money, 31 Jan. 2026
Hyaluronic acid, peptides, and botanical extracts provide pore-minimizing, firming, and line-smoothing properties.
—Tamim Alnuweiri, InStyle, 31 Jan. 2026
Cetaphil’s face serum uses purified peptides to improve your skin’s elasticity and reduce the appearance of lines.
—Lauren Taylor, Southern Living, 30 Jan. 2026
Brezavscek points barrier-supportive formulas, such as fatty acids, peptides, ceramides, hyaluronic acid, and niacinamide are key to soothe skin and restore its lipid balance.
—Kiana Murden, Vogue, 29 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 1 Feb. 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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