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

But its effect on glucagon is also noteworthy because that peptide hormone plays a role in how the body uses and burns calories for energy. —Daryl Austin, USA Today, 28 Mar. 2026

These included an anti-HIV antibody, a GLP-1-like peptide used for type 2 diabetes, and leptin, which regulates appetite. —Aamir Khollam, Interesting Engineering, 27 Mar. 2026

Niacinamide and tranexamic acid even tone and refine the look of pores, while ceramides, cholesterol, and peptides support the barrier—so skin looks smoother, brighter, and more refreshed in under 30 minutes. —Christa Joanna Lee, Allure, 26 Mar. 2026

In certain corners of the internet, peptides can fix just about anything. —Kerry Breen, CBS News, 26 Mar. 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