a gaseous decomposition product of organic matter, consisting primarily of methane.
a hydrocarbon gas largely composed of methane formed when organic material decays in the absence of air

marsh gas n.
See methane.


Read Also:

  • Marsh-grass

    noun 1. .

  • Marsh harrier

    noun 1. a European harrier, Circus aeruginosus, that frequents marshy regions 2. (US & Canadian) Also marsh hawk. a common harrier, Circus cyaneus, that flies over fields and marshes and nests in marshes and open land Also called (in Britain and certain other countries) hen harrier

  • Marsh-hawk

    noun 1. . noun 1. another name for marsh harrier (sense 2)

  • Marsh-hen

    noun 1. any of various rails or raillike birds. noun 1. any bird that frequents marshes and swamps, esp a rail, coot, or gallinule

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