Noun
- 1. sternocleidomastoid, sternocleidomastoid muscle, sternocleido mastoideus, musculus sternocleidomastoideus, skeletal muscle, striated muscle
- usage: 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
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