◄ Trephine ►

Dictionary
1. (n.) An instrument for trepanning, being an improvement on the trepan. It is a circular or cylindrical saw, with a handle like that of a gimlet, and a little sharp perforator called the center pin.

2. (v. t.) To perforate with a trephine; to trepan.

Thesaurus
aculeus acumination bit bore bore bit borer brace and bit breast auger breast drill broach burr chamfer bit corkscrew cross bit cusp diamond drill drill drill press gimlet hand drill keyway drill mucro neb needle nib point portable drill posthole auger power drill prick prickle pump drill ratchet drill reamer rotary drill star drill sting strap drill tap tip trepan trephine twist bit twist drill wimble
                                                                                                                                                                                                                                       

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