/ Dictionary / Index R radius of curvature: Meaning and Definition of Find definitions for: ra'dius of cur'vature Pronunciation: [key] — Math. Math. the absolute value of the reciprocal of the curvature at a point on a curve. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radius of convergence radius of gyration Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language