/ Dictionary / Index R radius rod: Meaning and Definition of Find definitions for: ra'dius rod" Pronunciation: [key] (in a feathering paddle wheel) any of the rods, meeting in a hub mounted eccentrically with the paddle-wheel shaft, for feathering the paddles while in the water. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radius of gyration radius vector Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language