Definition of "motor oil" []

• Oil for lubricating an internal-combustion engine (noun)

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• "DMNB and motor oil were the volatile components of composition C-4, a plastic explosive manufactured in the United States and used by the military."
• "The maker of rigid plastic bottles for products from juice to motor oil also revealed that the competing bid came from Reynolds Group Holdings Limited."
• "The air carried the smell of decay; rotting food and motor oil and animal waste and old sweat mixed with the rich, loamy scent of mud and the sharp, stinging odor of — — metal."