trepan

1. is a type of: surgical instrument - a medical instrument used in surgery
   same as: trephine
2. is a type of: drill - a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)

1. referred to in: operation, surgery, surgical operation, surgical procedure, surgical process - a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body
   is a type of: bore, drill - make a hole, especially with a pointed power or hand tool

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