sternocleidomastoid Syllabification: (ster·no·clei·do·mas·toid)Pronunciation: /ˌstərnōˌklīdəˈmastoid/ (also sternocleidomastoid muscle)Definition of sternocleidomastoid noun Anatomy each of a pair of long muscles that connect the sternum, clavicle, and mastoid process of the temporal bone and serve to turn and nod the head. sternocleidomastoid in other Oxford dictionaries Definition of sternocleidomastoid in the British & World English dictionary
