Triceps (noun)

A muscle located at the back of the upper arm, responsible for extending the arm at the elbow.

Origin:

From tri- + -ceps, from the latin word for three-headed, referring to the three heads of the muscle.

Examples:

1. He was doing triceps exercises to strengthen his arms.
2. The triceps muscle was sore after the workout.
3. He had well-defined triceps, a sign of regular arm exercise.
4. The triceps are important muscles for pushing movements.
5. The triceps are often worked in combination with the biceps during weightlifting exercises.