Dictionary  meth•an•o•genPronunciation: (me-than'u-jun, -jen"), [key] —n. any of a diverse group of widely distributed archaebacteria that occur in anaerobic environments, as the intestinal tracts of animals, freshwater and marine sediments, and sewage, and are capable of producing methane from a limited number of substrates, including carbon dioxide and hydrogen, acetate, and methylamines: an important source of natural gas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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