stilbenePronunciation: /ˈstɪlbiːn/Definition of stilbene noun [mass noun] Chemistry a synthetic aromatic hydrocarbon which forms phosphorescent crystals and is used in dye manufacture. Alternative name: trans-1,2-diphenylethene; chemical formula: C6H5CHCHC6H5 Origin: mid 19th century: from Greek stilbein 'to glitter' + -enestilbene in other Oxford dictionaries Definition of stilbene in the US English dictionary