isocetaneWiktionary 原文英美构词拆解isoiso-前缀cetanecetane词干iso-Same, identical. · Equal; equivalent.词源说明From iso- + cetane.释义名词noun1(organic chemistry) 2,2,4,4,6,8,8-heptamethylnonane, a highly branched alkane used as a reference in determining the cetane number of diesel.