Breadcrumb Home > Dictionary > Index P plumbaginous: Meaning and Definition of Find definitions for: plum•bag•i•nous Pronunciation: (plum-baj'u-nus), [key] — adj. containing graphite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plumbaginaceous plumbago ✖ Related Content Daily Word Quiz: tautology Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language