/ Dictionary / Index R radula: Meaning and Definition of Find definitions for: rad•u•la Pronunciation: (raj'oo-lu), [key] — pl. -lae a chitinous band in the mouth of most mollusks, set with numerous, minute, horny teeth and drawn backward and forward over the floor of the mouth in the process of breaking up food. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rad/s radwaste Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language