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

peptidic

pep-ˈti-dik 

adjective

Examples of peptide in a Sentence

Recent Examples on the Web

Those figures come from Sederma’s research on the raw peptide, not the finished cream, and Okoaskin’s Dual Action Lifting Cream lists acetyl dipeptide-1 cetyl ester at position 19 of its ingredient list. — Matthew Kayser, USA Today, 10 Sep. 2026

It’s formulated with hyaluronic acid, peptides, and niacinamide to promote hydration, increase collagen production, and visibly brighten skin. — Melony Forcier, InStyle, 10 Sep. 2026

Avocado oils and peptides also work to smooth out dry, rough strands and protect hair from heat damage for those who can’t quit their daily curling iron or flatiron habit. — Deanna Pai, Glamour, 10 Sep. 2026

Copper peptides, known as GHK-Copper or simply GHK-Cu, are one of the latest social media skin care hacks. — Brittney Melton, NPR, 9 Sep. 2026

Word History

Etymology

International Scientific Vocabulary, from peptone

First Known Use

1906, in the meaning defined above

Phrases Containing peptide

• amyloid beta peptide
• atrial natriuretic peptide
• beta-amyloid peptide
• gastric inhibitory peptide
• glucagon-like peptide
• glucose-dependent insulinotropic peptide
• opioid peptide
• peptide bond
• peptide linkage

Rhymes for peptide

• abide
• allied
• applied
• aside
• astride
• azide
• backside
• bankside
• bastide
• bayside
• bedside
• belied

Kids 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

peptidic

pep-ˈtid-ik 

adjective