: 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 Kosas Revealer Skin Improving Foundation acted as the perfect canvas—the skin tint is lightweight, buildable, and packed with skin-improving ingredients like peptides, hyaluronic acid, and niacinamide.
—
Kaitlin Clapinski, InStyle, 8 Mar. 2026
Some pair it with brightening ingredients like niacinamide and vitamin C, collagen-supporting retinoids and peptides, and hydrating agents that subtly plump thinning skin.
—Christa Joanna Lee, Allure, 8 Mar. 2026
L’Oréal’s Age Perfect Sunscreen tones, plumps, and brightens skin with collagen peptides and niacinamide, and the SPF 30 protects your skin from new signs of aging caused by sun exposure.
—Caley Sturgill, Southern Living, 6 Mar. 2026
Reports include adverse events such as high fever and heart palpitations from unapproved peptides.
—Cindy Krischer Goodman, Sun Sentinel, 5 Mar. 2026
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Kaitlin Clapinski, InStyle, 8 Mar. 2026
Some pair it with brightening ingredients like niacinamide and vitamin C, collagen-supporting retinoids and peptides, and hydrating agents that subtly plump thinning skin.
—Christa Joanna Lee, Allure, 8 Mar. 2026
L’Oréal’s Age Perfect Sunscreen tones, plumps, and brightens skin with collagen peptides and niacinamide, and the SPF 30 protects your skin from new signs of aging caused by sun exposure.
—Caley Sturgill, Southern Living, 6 Mar. 2026
Reports include adverse events such as high fever and heart palpitations from unapproved peptides.
—Cindy Krischer Goodman, Sun Sentinel, 5 Mar. 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 14 Mar. 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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