There are several synonyms for the term "pectoralis major," which refers to a large muscle in the chest region. Some possible alternatives include "chest muscle," "pectoral muscle," or simply "pecs." The pectoralis major is located on the front of the chest and is responsible for several important actions, including bringing the arms towards the body (adduction) and rotating the arms inward (internal rotation). Strengthening this muscle through exercises like push-ups, bench presses, and dumbbell flys can help improve upper body strength and stability. Whether you refer to it as the pectoralis major, chest muscle, or something else entirely, this powerful muscle plays an important role in many activities.