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The Collaborative International Dictionary of English v.0.48 (gcide)

Trepan \Tre*pan"\, n. [F. tr['e]pan (cf. Sp. tr['e]pano, It.
trepano, trapano), LL. trepanum, fr. Gr. ? a borer, auger,
trepan, fr. ? to bore, ? a hole. Cf. {Trephine}.]
1. (Surg.) A crown-saw or cylindrical saw for perforating the
skull, turned, when used, like a bit or gimlet. See
{Trephine}.
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2. (Mining) A kind of broad chisel for sinking shafts.
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Trepan \Tre*pan"\, v. t. & i. [imp. & p. p. {Trepanned}; p. pr.
& vb. n. {Trepanning}.] [Cf. F. tr['e]paner. See {Trepan} a
saw.] (Surg.)
To perforate (the skull) with a trepan, so as to remove a
portion of the bone, and thus relieve the brain from pressure
or irritation; to perform an operation with the trepan.
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Trepan \Tre*pan"\, n. [See {Trapan}.]
1. A snare; a trapan.
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Snares and trepans that common life lays in its way.
--South.
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2. a deceiver; a cheat.
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He had been from the beginning a spy and a trepan.
--Macaulay.
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Trepan \Tre*pan"\, v. t.
To insnare; to trap; to trapan.
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Guards even of a dozen men were silently trepanned from
their stations. --De Quincey.
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