knife-edge

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WORDNET DICTIONARY

Noun knife-edge has 1 sense

knife-edge(n = noun.attribute) Array - a narrow boundary; "he lived on a knife-edge between genius and insanity"

CIDE DICTIONARY

knife-edge, n.

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. [1913 Webster]

Knife-edge file. See Illust. of File.

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