trephine

A surgical instrument with a cylindrical saw usually used for removing a disk of bone, especially from the skull, or for removing corneal tissue.

To operate on with a trephine.

To operate upon with a trephine; trepan.

An improved form of the trepan, consisting of a cylindrical saw with a handle placed transversely, like that of a gimlet, and having a sharp steel point called the center-pin.

An instrument for trepanning, being an improvement on the trepan. It is a circular or cylindrical saw, with a handle like that of a gimlet, and a little sharp perforator called the center pin.

To perforate with a trephine; to trepan.

A surgical instrument used to remove a circular section of bone from the skull; a trepan.

To use a trephine during surgery.

a surgical instrument used to remove sections of bone from the skull

operate on with a trephine