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Pronunciation varies by accent · noun
(organic chemistry) any isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel.
Use isooctane when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Isooctane means (organic chemistry) any isomer of n-octane; especially 2,2,4-trimethylpentane, used as a reference in the determination of the octane number of fuel.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use isooctane where its definition matches the intended context.
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