Etymology
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acetylene (n.)

gaseous hydrocarbon, 1860, from French acétylène, coined by French chemist Pierre Eugène Marcellin Berthelot from chemical ending -ene + acetyl, which was coined from acetic + -yl in 1839 by German chemist Justus von Liebig. Liebig's coinage was in reference to a different radical; acetyl was transferred to its current sense in 1850s, but Berthelot's coinage was based on the original use of acetyl.

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Definitions of acetylene

acetylene (n.)
a colorless flammable gas used chiefly in welding and in organic synthesis;
Synonyms: ethyne / alkyne
From wordnet.princeton.edu