[trih-fahyn, -feen] Surgery.
a small circular saw with a center pin mounted on a strong hollow metal shaft to which is attached a transverse handle: used in surgery to remove circular disks of bone from the skull.
verb (used with object), trephined, trephining.
to operate upon with a trephine.

1620–30; spelling variant of trefine, orig. trafine, blend of trapan (variant of trepan1) and Latin phrase trēs fīnēs three ends (the inventor's explanation)

trephination [tref-uh-ney-shuhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trephine (trɪˈfiːn)
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 trefinetrepan1, allegedly from Latin trēs fīnēs literally: three ends; influenced also by English trepanetrepan1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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.

The American Heritage® Stedman's Medical Dictionary
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