1. A surgical instrument used to remove sections of bone from the skull
   - trephine 
2. A drill for cutting circular holes around a centre

1. Cut a hole with a trepan, as in surgery

Derived forms: trepanned, trepans, trepanning

Type of: bore, drill, surgical instrument

Encyclopedia: Trepan

• underhandedly
• underhung
• underivative
• underived
• underlay
• underlayment
• underlet
• underlie
• underline
• underling
• underlip
• underlying
• undermanned
• undermentioned
• undermine
• undermost
• underneath
• undernourish
• undernourished
• undernourishment
• underpants
• underpart
• underpass
• underpay
• underpayment