methanogen

noun
me·than·o·gen | \mə-ˈthan-ə-ˌjen \

Medical Definition of methanogen 

: any of various anaerobic microorganisms that produce methane from carbon dioxide and hydrogen, are classified as bacteria (as of the family Methanobacteriaceae) or as archaea, and include some found in the rumina of herbivores (as domestic cattle) that utilize cellulose

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