- a colorless gas, C2H2, having an etherlike odor, produced usually by the action of water on calcium carbide or by pyrolysis of natural gas: used especially in metal cutting and welding, as an illuminant, and in organic synthesis.
- a colourless flammable gas used in the manufacture of organic chemicals and in cutting and welding metals. Formula: C 2 H 2
- another name for alkyne
- (as modifier)
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