noun
operating surgeon; surgeon performing an operation
Refers specifically to the surgeon who actually performs the surgery, as opposed to an assistant or a surgeon in general. Often used in medical contexts or news reports.
See also: 外科医
執刀医は手術の前に患者に説明を行った。
The operating surgeon explained the procedure to the patient before the surgery.
彼はその病院で心臓
He serves as the operating surgeon for cardiac surgery at that hospital.