Definitions

1. noun

a person who trephines, especially in ancient times, a surgeon who performed trephining, an operation of drilling a hole in the skull to relieve pressure

“The trephiner’s skill was renowned in the ancient civilization.”

2. verb

to perform the operation of trephining, especially in ancient times, to relieve pressure in the skull by drilling a hole

“The ancient doctor trephined the patient to remove the blood clot.”