n.

a surgical instrument used to remove sections of bone from the skull

同義詞：trephine

a drill for cutting circular holes around a center

Trepanned core cutoff tool
A trepanned skull from the 19th century AD found in Steinhausen, Switzerland
Four trepanned skull from 5th and 16th century in Spain: surgery or ritual?
Surgical closure for closing trepanned hole in skull capsule
Surgical closure for closing trepanned hole in skull capsule
A Trepanned Skull of the Beaker Period from Dorset and the Practice of Trepanning in Prehistoric Europe.
Three trepanned skulls from the Copacabana Peninsula in the Titicaca Basin, Bolivia (800 BC-AD 1000).
Evaluation of surface deposits on the channel wall of trepanned reactor core graphite samples
A Novel Approach for Evaluating Surface Deposits on the Channel Wall Trepanned Graphite Samples
Laser-induced periodic surface structures formed on the sidewalls of microholes trepanned by a femtosecond laser