: 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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Key ingredients to seek out include ceramides, which repair the skin barrier; peptides, which support firmness; and squalane, which provides lightweight hydration.
—
Fort Worth Star-Telegram, 9 Apr. 2026
One scoop packs a whopping 11 grams of bovine collagen peptides.
—Brianna Peters, Vogue, 9 Apr. 2026
The formula also includes peptides to soften lines, cocoa extract to provide antioxidant protection, and chronocyclin, a skincare ingredient that helps boost vitamin D in the skin for more youthful-looking, bouncy skin.
—Alanna Martine Kilkeary, Glamour, 8 Apr. 2026
Similarly, physical activity has been shown to reduce a peptide called beta-amyloid, which causes plaque to build up in the brain and may play a role in Alzheimer’s disease and dementia, Hwang said.
—Kaitlin Sullivan, NBC news, 8 Apr. 2026
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Fort Worth Star-Telegram, 9 Apr. 2026
One scoop packs a whopping 11 grams of bovine collagen peptides.
—Brianna Peters, Vogue, 9 Apr. 2026
The formula also includes peptides to soften lines, cocoa extract to provide antioxidant protection, and chronocyclin, a skincare ingredient that helps boost vitamin D in the skin for more youthful-looking, bouncy skin.
—Alanna Martine Kilkeary, Glamour, 8 Apr. 2026
Similarly, physical activity has been shown to reduce a peptide called beta-amyloid, which causes plaque to build up in the brain and may play a role in Alzheimer’s disease and dementia, Hwang said.
—Kaitlin Sullivan, NBC news, 8 Apr. 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 Apr. 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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