/ Dictionary / Index P pyrobitumen: Meaning and Definition of Find definitions for: py•ro•bi•tu•men Pronunciation: (pī"rō-bi-t'mun, -ty'-, -bich'oo-), [key] — n. any of the dark, solid hydrocarbons including peat, coal, and bituminous shale. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyro pyroborate Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language