'sternocleidomastoid' definitions:
Definition of 'sternocleidomastoid'
From: WordNet
noun
One of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head [syn: sternocleidomastoid, sternocleidomastoid muscle, sternocleido mastoideus, musculus sternocleidomastoideus]