antiknock

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antiknock

a compound, such as lead tetraethyl, added to petrol to reduce knocking in the engine

antiknock

[′an·tē‚näk]
(materials)
Resisting detonation or pinging in spark-ignited engines.
A substance, such as tetraethyllead, added to motor and aviation gasolines to increase the resistance of the fuel to knock in spark-ignited engines. Also known as antidetonant.