propylene propylation • propylic · · · Info · Definitions · Synonyms · Characters · · propylene · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis. Synonyms: propene. · · Noun Definition 1 Synonyms · · · propene · · Synonym 1 Characters · · e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 y latin small letter y U+0079