methane /mēˈthān or methˈān/

An odourless, colourless, inflammable gas (CH₄), the simplest hydrocarbon, produced by decomposition of vegetable matter in wet conditions (also called marsh-gas, fire damp)

methan'ogen noun (biology)

A micro-organism that produces methane

methanoic /meth-ə-nōˈik/ acid noun

Formic acid

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