2 definitions found From WordNet (r) 2.0 [wn]: acetylene noun: a colorless flammable gas used chiefly in welding and in organic synthesis [syn: {ethyne}, {alkyne}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Acetylene \A*cet"y*lene\, noun (Chem.) A gaseous compound of carbon and hydrogen, in the proportion of two atoms of the former to two of the latter. It is a colorless gas, with a peculiar, unpleasant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant. --Watts.

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