- n any of various compounds that are added to gasoline to reduce engine knocking
- s suppressing or eliminating engine knock in combustion engines
- Since leaded antiknock compounds accounted for 36% of those sales and a hefty 60% of the profits, Ethyl may have more knocks ahead.
- Knocking quality is measured in octane, a 100% antiknock laboratory fluid.
- In 1935 100-octane (100% antiknock) fuel was a $30-a-gallon laboratory freak; now it runs about 13,000,000 barrels annually.