/ Dictionary / Index P plumb bob: Meaning and Definition of Find definitions for: plumb' bob" Pronunciation: [key] plummet (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plumbago plumbeous Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language