English Reference

Word

pectoral

Phoneticspec·toral

US/ˈpɛktɝəɫ/

UK/pˈɛktəɹəl/

Definition

n. a large, flat muscle on the front of your chest. It helps you move your arms forward and across your body.

n. a large, triangular muscle situated on the anterior surface of the thorax. In a zoological context, it refers to the corresponding muscle in birds and other animals, often associated with flight.

Examples

“The pectoral muscle is very strong in swimmers.”

“The athlete's training program focuses heavily on strengthening the pectoral muscles to improve his bench press performance.”

“In avian anatomy, the pectoral muscles are divided into two distinct groups: the large, powerful muscles responsible for the downstroke of flight and the smaller ones that handle the upstroke.”

Examples

simple

“The pectoral muscle is very strong in swimmers.”

contextual

“The athlete's training program focuses heavily on strengthening the pectoral muscles to improve his bench press performance.”

complex

“In avian anatomy, the pectoral muscles are divided into two distinct groups: the large, powerful muscles responsible for the downstroke of flight and the smaller ones that handle the upstroke.”

Real-World Examples

“Each dark ring on a fish’s scales, or on the pectoral fin spines of non-scaly fish such as sturgeons , represents a year of the animal’s life.”
Smithsonian Magazine · 16 Sept 2026
“The biker thinks it’s a joke at first and refuses, extinguishing his cigar on the T-800’s bared pectoral muscle—with no effect.”
Ars Technica · 28 Aug 2026

Etymology

All senses are ultimately from Latin pectorālis, but some may have come through Old French and Middle English.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Zoology

This entry

Level
C2 · Proficiency
Frequency
Occasional
Updated

Scan code

englishreference.com/q/pectoral

English Reference