noun
isooctane
A specific hydrocarbon used as a standard reference fuel in octane rating; technical term in chemistry and automotive engineering.
イソオクタンはオクタン価100の基準燃料として使われる。
Isooctane is used as the reference fuel with an octane rating of 100.
Loanword from English 'isooctane', itself from 'iso-' (indicating an isomer) + 'octane' (the eight-carbon alkane).