skull

skull
/skʌl; skʌl/ n
1 bony framework of the head under the skin 脑壳; 头颅骨
    The fall fractured his skull. 这一跤把他的颅骨摔裂了. =>illus at skeleton 见skeleton插图.
2 (idm 习语) a thick skull => thick.

牛津英汉双解词典