What is that which cuts; a machine or part of a machine, or a tool or instrument used for cutting, as that part of a mower which severs the stalk, or as a paper cutter called?

cutter — That which cuts; a machine or part of a machine, or a tool or instrument used for cutting, as that part of a mower which severs the stalk, or as a paper cutter. (Webster's 1913.)

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