Octane
/ˈɑkteɪn/
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Definition
(noun) Any of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in petroleum, especially an iso-octane 2,2,4 trimethyl-pentane; they are used as fuels and solvents.
Sentence Examples
The high-octane fuel was expensive but efficient.
The car required low-octane fuel to run smoothly.
CEFR Practice Quiz
High-performance engines require fuel with a higher ____ rating to prevent knocking.