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Related to methanogen: Thermophiles
Any of various anaerobic archaea that produce methane as a metabolic byproduct.
meth•an•o•gen(mɛˈθæn ə dʒən, -ˌdʒɛn)
any of a group of archaebacteria that occur in diverse anaerobic environments and are capable of producing methane from a limited number of chemical sources, as carbon dioxide and hydrogen.
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|Noun||1.||methanogen - archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas|