1. A dark oil consisting mainly of hydrocarbons
   - petroleum, crude oil, crude, rock oil, oil, black gold

Type of: fossil fuel, oil

• alkaline-loving
• alkalinise
• alkalinity
• alkalinize
• alkalinuria
• alkalise
• alkaliser
• alkalize
• alkalizer
• alkaloid
• alkaloidal
• alkalosis
• alkalotic
• alkaluria
• alkane
• alkane series
• alkanet
• alkapton
• agone
• agonic line
• Agonidae
• agonise
• agonised
• agonising
• agonisingly