ˈkyü(ˌ)mēn noun
( -s )
Etymology: International Scientific Vocabulary cum- + -ene; originally formed as French cumène
: a colorless oily hydrocarbon (CH 3 ) 2 CHC 6 H 5 obtained by acid-catalyzed alkylation of benzene with propylene and used as an additive for high-octane motor fuel; isopropyl-benzene