ethyne ethylsulphuric • ethynyl · · · Info · Definitions · Synonyms · Characters · · ethyne · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a colorless flammable gas used chiefly in welding and in organic synthesis. Synonyms: acetylene, alkyne. · · Noun Definition 1 Synonyms · · · acetylene · · Synonym 1 alkyne · · Synonym 2 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 n latin small letter n U+006E t latin small letter t U+0074 y latin small letter y U+0079