sternocleidomastoid (adj.)youdaoicibaDictYouDict[sternocleidomastoid 词源字典]
medical Latin, from sterno- "sternum," comb. form of Greek sternon or Latin sternum (see sternum) + Latinized comb. form of Greek kleis (see clavicle) + mastoid.[sternocleidomastoid etymology, sternocleidomastoid origin, 英语词源]