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Definition of: trephine
(tri·fīn′, -fēn′) noun Surg.
A cylindrical saw for removing a piece of bone from the skull, to relieve pressure, etc.
—v.t. ·phined, ·phin·ing To operate on with a trephine. [Earlier trafine <L tres fines three ends; infl. in form by trepan1]
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