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The Collaborative International Dictionary
Trephining

Trephine \Tre*phine"\, v. t. [imp. & p. p. Trephined; p. pr. & vb. n. Trephining.] To perforate with a trephine; to trepan.

Wiktionary
trephining

vb. (present participle of trephine English)

Usage examples of "trephining".

It wasn't just a simple trephining job that had been done on this increasingly mysterious liar.

I thought what would happen to his poor head, with the mark of trephining all the way around it, if I were to put the skull under the press and start applying it.