Meaning of sternocleidomastoid

ster•no•clei•do•mas•toid

Pronunciation: (stûr"nō-klī"du-mas'toid), [key]
— Anat. Anat.
—adj.
  1. of, pertaining to, or involving the sternum, the clavicle, and the mastoid process.
—n.
  1. a thick muscle on each side of the neck, the action of which assists in bending the head and neck forward and sideways.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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