1. designed to prevent or reduce engine knock in internal combustion engines
Usage: automotive

1. a substance added to gasoline to prevent engine knock
Usage: automotive

Examples

• The mechanic recommended using antiknock gasoline for the high-performance engine.
• Modern cars require fuel with antiknock additives to run smoothly.
• The antiknock compound prevents premature ignition in the cylinders.
• Premium gasoline contains more antiknock agents than regular fuel.
• Lead was once used as an antiknock additive before being banned.
• The engine’s antiknock rating determines what octane fuel it needs.