1. (noun) a surgical instrument used to remove sections of bone from the skull

• trephine

1. (noun) a surgical instrument used to remove sections of bone from the skull

• surgical instrument

2. (noun) a drill for cutting circular holes around a center

• drill

3. (verb) cut a hole with a trepan, as in surgery

• bore
• drill

1. (verb) cut a hole with a trepan, as in surgery

• operation
• surgery
• surgical operation
• surgical procedure
• surgical process

1. (noun) a surgical instrument used to remove sections of bone from the skull

• trephine

2. (verb) cut a hole with a trepan, as in surgery

• trephine