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. 2014.
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World English Dictionary
marsh gas
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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Example sentences
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.
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