† Persian drilln.Obsoleterare a hand drill operated by moving a nut backward and forward along the long-pitched thread of a screw which carries the drill, which is thereby forced to revolve in alternating directions.
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1875 E. H. KnightAmer. Mech. Dict. III. 1671/2 A hand-drill..sometimes known as the Persian drill..is frequently used for fine work and in dentistry.