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

Ingredients like niacinamide, peptide, salicylic acid, lactic acid, and glycerin combine to create a powerful formula that delivers instant results. —Claire West, Parents, 13 Feb. 2026

The nourishing body butter also contains peptides to improve the appearance of wrinkles and boost your skin’s elasticity. —Kyra Surgent, InStyle, 11 Feb. 2026

In addition to the PDRN, the serum’s formula also contains five types of peptides to improve skin elasticity, niacinamide to brighten dark spots, and more. —Melanie Fincher, Southern Living, 10 Feb. 2026

Last year, the company launched its low-testosterone treatment program and bought a peptide-manufacturing facility. —Yasmin Tayag, The Atlantic, 8 Feb. 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
• 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