/ Dictionary / Index P prony brake: Meaning and Definition of Find definitions for: pro'ny brake" Pronunciation: (prō'nē), [key] a friction brake serving as a dynamometer for measuring torque. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pronunciation pro-oestrus Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language