trephination

trephine

[trih-fahyn, -feen] Surgery.
noun
1.
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.
2.
to operate upon with a trephine.

Origin:
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
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World English Dictionary
trephine (trɪˈfiːn)
 
n
1.  a surgical sawlike instrument for removing circular sections of bone, esp from the skull
 
vb
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]
 
trephination
 
n

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

trephination treph·i·na·tion (trěf'ə-nā'shən)
n.
Removal of a circular piece of bone, especially of the skull, by a trephine. Also called trepanation.

trephine tre·phine (trĭ-fīn')
n.
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.

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