isooctane

(ī′sō äk′tān, -sə-)

noun

a liquid hydrocarbon, (CH)CHCHC(CH), used with normal heptane to prepare antiknock rating standards and arbitrarily assigned an octane rating of 100

Origin: iso- + octane

See isooctane in American Heritage Dictionary 4

noun

A highly flammable liquid, (CH₃)₂CHCH₂C(CH₃)₃, used to determine the octane ratings of fuels.

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