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marsh gas

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noun

a gaseous decomposition product of organic matter, consisting primarily of methane.

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Also called swamp gas.

Origin of marsh gas

An Americanism dating back to 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for marsh gas

British Dictionary definitions for marsh gas

marsh gas

noun

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

Medical definitions for marsh gas

marsh gas

n.

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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