• IPA: /ə ˈsɛt əl ˌin/


  1. (organic chemistry, countable) Any organic compound having one or more carbon–carbon triple bonds; an alkyne.
  2. (organic compound, uncountable) Ethyne; the simplest alkyne, a hydrocarbon of formula HC≡CH. It is a colourless, odorless gas, formerly used as an illuminating gas, but now used in welding or metallurgy.
  3. A lamp powered by acetylene, particularly a motor vehicle headlight.
    • 1908, Upton Sinclair, The Metropolis, Moffat, Yard & Company, New York, page 69:
      Mrs. Winnie had kindly sent her limousine car for them, and it stood throbbing in front of the hotel-entrance, its acetylenes streaming far up the street.
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