Definition of marsh gas in English:

marsh gas

Line breaks: marsh gas

noun

[mass noun]
Methane, especially as generated by decaying matter in marshes.
More example sentences
  • Methane is often called marsh gas because it forms in swamps and marshes from the underwater decomposition of plant and animal material.
  • Occasionally a hiss of marsh gas would sound, like a snake's venomous warning.
  • The smell of sulfurous marsh gas drifted over the stockade to mix with the smell of disease and spoiling food.

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