Meaning of pyrobitumen

py•ro•bi•tu•men

Pronunciation: (pī"rō-bi-t'mun, -ty'-, -bich'oo-), [key]
— n.
  1. any of the dark, solid hydrocarbons including peat, coal, and bituminous shale.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.