antiknock

American  

[an-tee-nok, an-tahy-, an-tee-nok, an-tahy-] / ˌæn tiˈnɒk, ˌæn taɪ-, ˈæn tiˌnɒk, ˈæn taɪ- /

adjective

1. noting or pertaining to a substance, as tetraethyllead or ferrocene, used as a fuel additive for an internal-combustion engine to eliminate or minimize knock.

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noun

1. such a substance added to fuel in an internal-combustion engine.

antiknock British  

/ ˌæntɪˈnɒk /

noun

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

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Etymology

Origin of antiknock

First recorded in 1920–25; anti- + knock

Example Sentences

In 1962, with his two sons, Gottwald bought Ethyl Corp., the world's largest producer of lead antiknock compounds for gasoline.

From Time Magazine Archive

The more and more powerful engines required gasolines with higher octane ratings, which is a measure of antiknock properties.

From Time Magazine Archive

Octane rating is the index of antiknock qualities.*

From Time Magazine Archive

The refiners treat their gas with this antiknock compound, may sell the treated gas only to jobbers who are also licensed by the top company.

From Time Magazine Archive

Because methane is h'gh in antiknock value, special high-compression engines which save 15% in fuel consumption are now available for this fuel.

From Time Magazine Archive