pectoralis
/ˌpɛktəˈrælɪs/
noun
- Either of two large chest muscles (pectoralis major and pectoralis minor) that move the shoulder and arm.
- Swimmers often develop strong pectoralis muscles from repetitive arm strokes.
- The anatomy diagram labels the pectoralis major as the large fan-shaped muscle in the upper chest.
- He strained his pectoralis while lifting weights at the gym.