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A surgical instrument with a cylindrical saw usually used for removing a disk of bone, especially from the skull, or for removing corneal tissue.
tr.v. tre·phined, tre·phin·ing, tre·phines
To operate on with a trephine.

[French tréphine, from obsolete English trefine, from Latin trēs fīnēs, three ends : trēs, three; see trei- in Indo-European roots + fīnēs, pl. of fīnis, end.]

treph′i·na′tion (trĕf′ə-nā′shən) n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.trephination - an operation that removes a circular section of bone from the skulltrephination - an operation that removes a circular section of bone from the skull
surgical operation, surgical procedure, surgical process, surgery, operation - a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; "they will schedule the operation as soon as an operating room is available"; "he died while undergoing surgery"


n. trefinación, acto de cortar un tejido o un hueso con un corte circular o de disco, operación gen. efectuada en el cráneo.
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References in periodicals archive ?
Trephination was also employed for seizures throughout the nineteenth century (R.
Shamans bored the skull of live patients to make burr holes, a process called trephination to allow these spirits to escape.
The trephination areas and sinuses were selected based on anatomy, but they may be modified according to the purposes of the exam (SMITH, 2006).
A brief history of psychosurgery: Part 1 From trephination to lobotomy.
The procedure for CLAL transplantation was similar to that described for CLAU; KLAL transplantation was conducted using the 360[degrees] corneoscleral ring remaining after an 8 mm trephination, divided into two segments.
The donor lenticule was then placed endothelial side up and trephination was performed from the endothelial side.
Frontal sinus trephination (FST) has numerous applications in the treatment of acute and chronic sinus disease.
A number of variations including changing the size, shape, and position of the sclerostomy and trapdoor, limbal, or fornix based conjunctival incisions, and altering the method of performing the sclerostomy by trephination, sclerectomy and the use of a scleral punch have been introduced.
Fourteen days after presentation the macaw was anesthetized for trephination of the infraorbital sinuses.
If the bleed is one week or more old, air-powered burr holes or trephination are drilled into the dura to drain the blood.
Trigger point injection and skull trephination are added back into this edition.
You need a brainwash or a flail, A trephination, something.