|1.||a surgical sawlike instrument for removing circular sections of bone, esp from the skull|
|2.||(tr) to remove a circular section of bone from (esp the skull)|
|[C17: from French tréphine, from obsolete English trefine|
trephination treph·i·na·tion (trěf'ə-nā'shən)
Removal of a circular piece of bone, especially of the skull, by a trephine. Also called trepanation.
trephine tre·phine (trĭ-fīn')
A cylindrical or crown saw for the removal of a disk of bone, especially from the skull, or removal of other firm tissue such as that of the cornea. v. tre·phined, tre·phin·ing, tre·phines
To operate on with a trephine.