/ Dictionary / Index T tooth decay: Meaning and Definition of Find definitions for: tooth' decay". Pronunciation: [key] See dental caries. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tooth chisel toothed whale Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language