A surgical instrument powered by electricity that uses a rotating circular saw to remove a disc of bone, typically from the skull.
From electro- + trephine (from Greek trema, 'hole'). The trephine itself is an ancient surgical tool; the electric version was developed in the late 1800s.
An electrotrephine is basically an electric-powered drill for surgeons—when doctors need to open the skull for brain surgery, they use this to remove a perfect circular disc of bone without damaging the soft tissue underneath.
Complete word intelligence in one call. Free tier — 50 lookups/day.