The Collaborative International Dictionary
Sternomastoid
Sternomastoid \Ster`no*mas"toid\, a. (Anat.) Of or pertaining to the sternum and the mastoid process.
Wiktionary
sternomastoid
a. (context anatomy English) Of or pertaining to the sternum and the mastoid process
Usage examples of "sternomastoid".
Muirhead cites an instance in which a firm, broad strip of cartilage resembling sternomastoid extended from below the left ear to the left upper corner of the sternum, being entirely separate from the jaw.
The sternomastoids and the trapezius muscles alone are enough to prevent it.