/ Dictionary / Index P plomb: Meaning and Definition of Find definitions for: plomb Pronunciation: (plum), [key] — n. Surg. any inert material inserted into a body cavity for therapeutic purposes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ploidy plonk Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language