me·than·o·gen (m -th n -jn)n. Any of various archaea that are capable of producing methane from the decomposition of organic material. |
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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 archaebacteria, archaebacterium, archaeobacteria, archeobacteria - considered ancient life forms that evolved separately from bacteria and blue-green algae |
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