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.
- A colorless, highly flammable or explosive gas, C2H2, used for metal welding and cutting and as an illuminant. Also called ethyne.