| petroleum | | |
| n. (substance) | 1. crude, crude oil, fossil oil, oil, petroleum, rock oil | a dark oil consisting mainly of hydrocarbons. |
| ~ atomic number 6, carbon, c | an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds. |
| ~ fossil fuel | fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content. |
| ~ oil | a slippery or viscous liquid or liquefiable substance not miscible with water. |
| ~ resid, residual oil | oil products that remain after petroleum has been distilled. |
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