<p><strong>Noun</strong></p><ul><li>definition: a tool for cutting shallow holes by removing a core</li><li>context: Surgery</li><li>description: an obsolete form of the trephine resembling a carpenter's bit and brace</li></ul><p><strong>Verb</strong></p><ul><li>used with object: trepan</li><li>definitions:<ul><li>to cut circular disks from (plate stock) using a rotating cutter (Machinery)</li><li>to operate upon with a trepan; trephine (Surgery)</li></ul></li></ul>