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knifeedge

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1. A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction. Knife-edge file. See Illust. of File. Source: webster

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file piece knife-edge acute angle axis beam edge friction least motion oscillate pendulum possible required resting scale see serving sharpened smooth steel surface

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