[pahy-roh-bi-too-muhn, -tyoo-, -bich-oo-]
any of the dark, solid hydrocarbons including peat, coal, and bituminous shale.

1900–05; pyro- + bitumen

pyrobituminous, pyrobituminoid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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