
1) Archaebacteria 2) Archaebacterium 3) Archaeobacteria 4) Archeobacteria
Found on
https://www.crosswordclues.com/clue/methanogen

Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are classified as archaea, a domain distinct from bacteria. They are common in wetlands, where they are responsible for marsh gas, and in the digestive tracts of animals such as ruminants and humans, where they are responsible for the methane co...
Found on
http://en.wikipedia.org/wiki/Methanogen

Methanogens. Credit: Maryland Astrobiology Consortium, NASA, and STScI A microorganism that produces methane as a byproduct of its metabolism. All known methanogens are both archaeans and obligate anaerobes, that is, they cannot live in the presence of oxygen. They are commonly found in wetlands...
Found on
http://www.daviddarling.info/encyclopedia/M/methanogen.html

A methane-producing prokaryote, member of the Archaea. ... (09 Oct 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

A type of archabacterium which is capable of producing methane gas.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: meth-an′ō-jen Definitions: 1. Any methane-producing bacterium of the family Methanobacteriaceae.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=54730

[
n] - archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane
Found on
http://www.webdictionary.co.uk/definition.php?query=methanogen

methanogen A methanogenic organism; specifically, any of the group of methane-producing archaebacteria that are found in anaerobic environments and in the guts of animals; especially, ruminants and arthropods.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2980/

microorganism that produces gaseous methane
Found on
https://courses.lumenlearning.com/microbiology/chapter/glossary/
noun archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.