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fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
gas, natural gas
a fossil fuel in the gaseous state; used for cooking and heating homes
crude, crude oil, fossil oil, oil, petroleum, rock oil
a dark oil consisting mainly of hydrocarbons
anthracite, anthracite coal, hard coal
a hard natural coal that burns slowly and gives intense heat
bituminous coal, soft coal
rich in tarry hydrocarbons; burns readily with a smoky yellow flame
brown coal, lignite, wood coal
intermediate between peat and bituminous coal
coal suitable for use under steam boilers
resid, residual oil
oil products that remain after petroleum has been distilled