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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 ?
Frontal sinus trephination (FST) has numerous applications in the treatment of acute and chronic sinus disease.
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.
Treatment modalities vary from curettage and bone grafting to trephination with injection of allogeneic demineralized bone matrix and autogenous bone marrow.
Trephination was common practice and the osteological evidence is that survival was high and the rate of infection low.
Since trephination was practiced for a number of reasons (including allowing egress of bad spirits in cases of illness and head injury), it is conceivable that the trephination was made directly over a depressed skull fracture.