rectus
/ˈrɛktəs/
noun
- Any of several straight muscles in the body, especially in the abdomen (rectus abdominis) or the eye (rectus muscles).
- Eye exercises can help strengthen the rectus muscles that control movement.
- The rectus abdominis is the muscle that gives you a 'six-pack' look.
- He pulled a rectus muscle while doing sit-ups at the gym.