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Any of various anaerobic archaea that produce methane as a metabolic byproduct.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(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.
meth•an`o•gen′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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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References in periodicals archive ?
The importance of methanogenic bacteria associated with ciliate protozoa was estimated either by removing protozoa from whole rumen fluid or by isolating the protozoa.
The methanogenic bacteria. In: The Prokaryotes, 2nd ed A handbook on the biology of bacteria.
King, "Utilization of hydrogen, acetate, and "noncompetitive"; substrates by methanogenic bacteria in marine sediments," Geomicrobiology Journal, vol.
Classification of aligned reads in a FunGene database resulted in the identification of 14 different species of methanogenic bacteria and 2 uncultured/unclassified archaeal species.
In total, 4133 methanogenic bacteria were classified into Archaea domain and Crenarchaeota and Euryarchaeota are most visible group [33].
Increased dried distillers grains with solubles (DDGS) inclusion and decreased corn particle size have been shown to lower ruminal pH and reduce methanogenic bacteria and hydrogen production.
[8] studied anaerobic degradation of indole by a consortium of methanogenic bacteria that degraded indole to methane within seven to eighteen weeks.
(iii) pH: the methanogenic bacteria achieve greater productivity with pH between 6.8 and 7.2.
Protection of methanogenic bacteria from low pH and toxic materials by immobilization using polyvinyl alcohol.