swamp-gas

swamp gas

noun
Dictionary.com Unabridged

marsh gas

noun
a gaseous decomposition product of organic matter, consisting primarily of methane.
Also called swamp gas.


Origin:
1775–85, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
marsh gas
 
n
a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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