/ Dictionary / Index R rigid frame: Meaning and Definition of Find definitions for: rig'id frame' Pronunciation: [key] (in iron, steel, and reinforced-concrete construction) a bent having absolutely rigid connections at the knees. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rigid rigidify Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language