marsh gas

1. 1.

   methane gas produced when vegetation decomposes in water

   Broadermethane

Questions about marsh gas

What does marsh gas mean?

marsh gas means "methane gas produced when vegetation decomposes in water".

Is marsh gas a common word?

marsh gas is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.