pectoralisyoudaoicibaDictYouDict[pectoralis 词源字典]
"Any of the major pectoral muscles in tetrapods; specifically = pectoralis major", Early 17th cent.; earliest use found in Helkiah Crooke (1576–1648), physician and anatomist. From post-classical Latin pectoralis, use as noun (short for pectoralis musculus) of classical Latin pectorālis, adjective.[pectoralis etymology, pectoralis origin, 英语词源]