hexane Syllabification: (hex·ane)Pronunciation: /ˈhekˌsān/Definition of hexane noun Chemistry a colorless liquid hydrocarbon of the alkane series. Chemical formula: C6H14; five isomers, especially the straight-chain isomer ( n-hexane) Origin: late 19th century: from hexa- 'six' (denoting six carbon atoms) + -ane2hexane in other Oxford dictionaries Definition of hexane in the British & World English dictionary