octane rating

octane rating
noun
a measure of the antiknock properties of gasoline
Syn: ↑octane number
Hypernyms: ↑measure, ↑quantity, ↑amount

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noun

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octane number or octane rating noun
The percentage by volume of so-called iso-octane (see under ↑iso-) in a mixture with normal heptane which has the same knocking characteristics as the motor fuel under test
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Main Entry:octane

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octane number or octane rating,
a number indicating the quality of a motor fuel, based on its antiknock properties. The higher the compression ratio of an engine, the higher the octane number of its fuel to have satisfactory performance.

Useful english dictionary. 2012.

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  • octane — (n.) hydrocarbon of the methane series, 1872, coined from octo (see OCTA (Cf. octa )) + ANE (Cf. ane); so called because it has eight carbon atoms. A fuel s octane rating, in reference to its anti knocking quality, is attested from 1932 …   Etymology dictionary

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