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τρύπανον). Any instrument used for boring holes in wood, stone, or metal. Of these there were several varieties—e. g., the terebra antiqua, a drill-borer; terebra gallica, a large gim let, etc. See Blümner, Technologie, ii. pp. 223-226.


A military engine for boring into the walls of a besieged town. See Aries.

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