KNIFEEDGE
Knife"*edge`, n. (Mech.)
Definition: 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.
Knife"*edge`, n. (Mech.)
Definition: 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’s Unabridged Dictionary 1913 Edition