butylene butylation • butylic · · · Info · Definitions · Synonyms · Characters · · butylene · · Text Latin · · Script 8 · · Length Definitions · · · (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers. Synonyms: butene. · · Noun Definition 1 Synonyms · · · butene · · Synonym 1 Characters · · b latin small letter b U+0062 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079