ˈäkˌtān sometimes ̷ ̷ˈ ̷ ̷ noun
( -s )
Etymology: International Scientific Vocabulary octa- + -ane
1. : any of several isomeric liquid paraffin hydrocarbons C 8 H 18 : as
a. : the normal hydrocarbon CH 3 (CH 2 ) 6 CH 3 found in petroleum
b. : isooctane b
2. : octane number
100- octane gasoline
3. : motor fuel as rated by octane number
octane -propelled vehicles
100- octane cracking plants