cranium (n.)youdaoicibaDictYouDict[cranium 词源字典]
early 15c., craneum, from Medieval Latin cranium "skull," from Greek kranion "skull, upper part of the head," related to kara (poetic kras) "head," from PIE root *ker- (1) "horn, head" (see horn (n.)). Strictly, the bones which enclose the brain.[cranium etymology, cranium origin, 英语词源]