Pronunciation: (u-set'l-ēn", -in), [key]
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 esp. in metal cutting and welding, as an illuminant, and in organic synthesis. Also called ethine, ethyne.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.