Definition of "perforator" [per•fo•ra•tor]

• A tool or machine that makes holes, or perforates, materials such as paper and card. (noun)
• A machine that can bore a tunnel underground. (noun)

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• "This was done in a special machine of Edison's invention, called a perforator, consisting of a series of punches operated by a bank of keys -- typewriter fashion."
• "The piles are constructed by first ramming a hole in the ground by repeatedly dropping a conical "perforator" weighing some two tons."
• "The view Fig. 52 shows the "perforator" and the tamping apparatus at work."