| Main Entry: | fossil fuel |
| Part of Speech: | noun |
| Definition: | fuel derived from prehistoric organisms |
Synonyms: |
hydrocarbon deposit, nonrenewable energy, nonrenewable fuel source |
| Main Entry: | petroleum |
| Part of Speech: | noun |
| Definition: | oil |
Synonyms: |
crude oil, fossil fuel, fuel, gas, gasoline, kerosene, naphtha, natural gas, petrol |