cranial drill
tool for drilling simple burr holes (trepanation) or for creating larger openings in the skull
en-US/ˈkɹeɪˌniəl ˈdɹɪl/
en-GB/ˈkɹeɪnɪəl ˈdɹɪl/
tool for drilling simple burr holes (trepanation) or for creating larger openings in the skull