isooctaneWiktionary 原文英美构词拆解isoiso-前缀octaneoctane词干iso-Same, identical. · Equal; equivalent.词源说明From iso- + octane.释义名词noun1(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