the sternoclidomastoid is a word that u might hear when u r in health class (bouring)(lol but its still a cool word.) it is locxated where your sternum is witch is also called the breast bone. The sternoclidomastoid has a name like this because it is near the sternum witch is sterno and the clavicle (sholder blade)clido and the mandable(jaw) mastoid
the sternoclidomastoid is a muscle on your body like your hamstring but that is just another muscle it has nothing to do with it lol
by Andrew March 04, 2005
The Urban Dictionary Mug
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