Definition of "trepanning" [trepanning]

• Present participle of trepan. (verb)

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• "This occasioned his going through the operation called trepanning, which is performed by an engine like a coffee-mill, which being fixed on the bruised part of the bone, is turned round, and cuts out all the black till the edges appear white and sound."
• "Known as trepanning, it was an ancient procedure and a desperate one."
• "I made the diagnosis that a splinter of bone was pressing upon the brain, and that the surgical operation known as trepanning was required."