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marsh gas

a gaseous decomposition product of organic matter, consisting primarily of methane.
Also called swamp gas.
1775-85, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for marsh gas
  • Well, a crowd gathered round and a scientist said it was marsh gas.
  • Also called marsh gas, methane is a colorless, odorless gas.
  • We always thought it was marsh gas or phosphorus but some believed that the lights were spirits or fairies, good or bad.
British Dictionary definitions for marsh gas

marsh gas

a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air
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
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marsh gas in Medicine

marsh gas n.
See methane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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