{ Center, orCentre, punch }. (Mech.) (a) A punch for making indentations or dots in a piece of work, as for suspension between lathe centers, etc. (b) A punch for punching holes in sheet metal, having a small conical center to insure correct locating.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.