[uh-set-l-een, -in]
noun Chemistry.
a colorless gas, C 2 H 2 , 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.
Also called ethine, ethyne.

1860–65; acetyl + -ene

acetylenic [uh-set-l-en-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acetylene (əˈsɛtɪˌliːn)
1.  Systematic name: ethyne a colourless flammable gas used in the manufacture of organic chemicals and in cutting and welding metals. Formula: C2H2
2.  a.  another name for alkyne
 b.  (as modifier): acetylene series

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1864, coined by Fr. chemist Marcelin-Pierre-Eugène Berthelot (1823-1907) from acetyl (coined from acetic in 1839 by Ger. chemist Justus von Liebig) + chemical ending -ene.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acetylene a·cet·y·lene (ə-sět'l-ēn', -ən)
A colorless, highly flammable, and explosive gas used for metal welding and cutting and as an illuminant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
acetylene   (ə-sět'l-ēn', -ən)  Pronunciation Key 
A colorless, highly flammable or explosive gas with a characteristic sweet odor. It is used in welding torches and in the manufacture of organic chemicals such as vinyl chloride. Acetylene is the simplest alkyne, consisting of two carbon atoms joined by a triple bond and each attached to a single hydrogen atom. Also called ethyne. Chemical formula: C2H2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The enzyme also speeds up other chemical reactions, including converting
  acetylene into methane.
Natural gas is broken down under high temperatures into acetylene and a
  liquid-phase step converts the acetylene into ethylene.
The idea to limit acetylene torches and similar devices from historic
  renovation work has caught on among preservationists.
It is a common practice in the welding industry to store acetylene in acetone.
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