Trepan(n.)
- A crown-saw or cylindrical saw for perforating the skull, turned, when used, like a bit or gimlet. See Trephine.
Trepan(n.)
- A kind of broad chisel for sinking shafts.
Trepan(v. t. & i.)
- To perforate (the skull) with a trepan, so as to remove a portion of the bone, and thus relieve the brain from pressure or irritation; to perform an operation with the trepan.