/ Dictionary / Index K knife edge: Meaning and Definition of Find definitions for: knife' edge" Pronunciation: [key] the cutting edge of a knife. anything very sharp. a wedge on the fine edge of which a scale beam, pendulum, or the like, balances or oscillates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. knife box knife-edged Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language