Trepan
131trephine — n. & v. n. an improved form of trepan with a guiding centre pin. v.tr. operate on with this. Derivatives: trephination n. Etymology: orig. trafine, f. L tres fines three ends, app. formed after TREPAN …
132tre|pan — tre|pan1 «trih PAN», noun, verb, panned, pan|ning. –n. 1. an early form of the trephine. 2. a boring instrument, used for sinking shafts. –v.t. 1. = trephine. (Cf. ↑trephine) 2. to bore through with a trepan; cut a disk out of with a trepan or… …
