[ uh-set-l-een, -in ]
/ əˈsɛt lˌin, -ɪn /

noun Chemistry.

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.

Origin of acetylene

First recorded in 1860–65; acetyl + -ene
Also called ethine, ethyne.


a·cet·y·len·ic [uh-set-l-en-ik] /əˌsɛt lˈɛn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for acetylene

British Dictionary definitions for acetylene

/ (əˈsɛtɪˌliːn) /


a colourless flammable gas used in the manufacture of organic chemicals and in cutting and welding metals. Formula: C 2 H 2Systematic name: ethyne
  1. another name for alkyne
  2. (as modifier)acetylene series

Derived forms of acetylene

acetylenic (əˌsɛtɪˈlɛnɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for acetylene

[ ə-sĕtl-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.

Scientific definitions for acetylene

[ ə-sĕtl-ēn′, -ən ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.