| NOUN | substance | fossil fuel | fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content |
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| Meaning | fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content. | |
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| Narrower | coal | fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period |
| natural gas, gas | A fossil fuel in the gaseous state | |
| petroleum, crude oil, crude, rock oil, fossil oil, oil | A dark oil consisting mainly of hydrocarbons | |
| Broader | fuel | A substance that can be consumed to produce energy |
| Spanish | combustible fósil, petróleo | |
| Catalan | combustible fòssil, petroli | |
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