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trephine

 [trĕ-f€īn´, trĕ-fēn´]
1. a saw for removing a disk of bone, chiefly from the skull.
Trephine. From Dorland's, 2000.
2. an instrument for removing a circular area of cornea.
3. to remove with this instrument.

trepan

(trĭ-păn′)
n.
1. A rock-boring tool used in mining for sinking shafts.
2. Medicine A trephine.
tr.v. tre·panned, tre·panning, tre·pans
1. To bore (a shaft) with a trepan.
2. To bore or otherwise make a hole in (the skull), as in certain prehistoric cultures or in surgery using a trephine.

trep′a·na′tion (trĕp′ə-nā′shən) n.

trepan

See trephine.

tre·phine

, trepan (trē-fīn', trĕ-pan')
1. A cylindric or crown saw used for the removal of a disc of bone, especially from the skull, or of other firm tissue as that of the cornea.
2. To remove a disc of bone or other tissue by means of a trephine.
[contrived fr. L. tres fines, three ends]

tre·phine

, trepan (trē-fīn', trĕ-pan')
1. A cylindric or crown saw used for the removal of a disc of bone, especially from the skull, or of other firm tissue.
2. To remove a disc of bone or other tissue by means of a trephine.
[contrived fr. L. tres fines, three ends]

trepan

trephine.
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References in periodicals archive ?
But you'll have to search long and hard to equal my favourite: "Medley of passion fruit on a monkfish coulis, nougatine of hake on a trio of lark's bowels and twiddlies of brain, trepanned, seared and lobotomised, and served with medallions of barn owl on a warm mucous salad with thrice- poached Keta caviar surmounted by collops of multicoloured glazed pigeon entrails, on layers of thrice-masticated haggis.
Yet civilians knew that they were often trepanned into the service, subjected to atrocious conditions that were quite similar to - or were simply a military form of slavery, and generally abused, while the bones of most would remain forgotten in some remote land, or under the ocean's depths.
He and his colleagues recovered portions of some forty human remains, including the skull of a man who had been trepanned and yet survived.
Other applications include thin-section bores, trepanned bores, shaft diameters, and tapered bores.