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marsh gas

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noun
  1. a gaseous decomposition product of organic matter, consisting primarily of methane.
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Origin of marsh gas

An Americanism dating back to 1775–85
Also called swamp gas.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for marsh gas

Historical Examples

  • Many varieties of coal give off a gas known as marsh-gas or fire-damp.

    The Wonder Book of Knowledge

    Various


British Dictionary definitions for marsh gas

marsh gas

noun
  1. a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air
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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

marsh gas in Medicine

marsh gas

n.
  1. methane