fossil fuel

The definition of fossil fuel is an organic substance from the geologic period which is found underground and is used as a source of energy.

(noun)

An example of a fossil fuel is coal.

See fossil fuel in Webster's New World College Dictionary

an organic substance, as coal, petroleum, etc., found underground in deposits formed in a previous geologic period and used as a source of energy

See fossil fuel in American Heritage Dictionary 4

noun

A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time and used for fuel.

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