Also found in: Thesaurus, Medical, Encyclopedia.


n. pl. ar·chae·bac·te·ri·a


pl n, sing -rium (-rɪəm)
(Microbiology) (formerly) a group of microorganisms now regarded as members of the Archaea. See archaean
[from archaeo- + bacteria]


(ˌɑr ki bækˈtɪər i ə)

also ar•chae•o•bac•te•ri•a

(ˌɑr ki oʊ-), sing. -te•ri•um (-ˈtɪər i əm)
a group of microorganisms, including methanogens and halobacteria, that are genetically and functionally different from all other living forms, thrive in oxygen-poor environments, and are sometimes classified as a separate kingdom.
[1977; < New Latin, =archae-, irreg. for archaeo- archaeo- (perhaps an erroneous Latinizing of Greek arche- arche-) + bacteria bacteria]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.archaebacteria - considered ancient life forms that evolved separately from bacteria and blue-green algaearchaebacteria - considered ancient life forms that evolved separately from bacteria and blue-green algae
moneran, moneron - organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis
division Archaebacteria - in some classifications considered a kingdom
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
halophil, halophile - archaebacteria requiring a salt-rich environment for growth and survival
thermoacidophile - archaebacteria that thrive in strongly acidic environments at high temperatures
References in periodicals archive ?
Optimum temperature range of cellulases activity of 80-100 [degrees]C had been reported for enzymes isolated from several archaebacteria (67).
[3] The mechanism of water transport across the epithelia is well known in vertebrates, invertebrates, plants, eubacteria, archaebacteria, and other microbes.
Strategies are following: a decreasing of the number of the methanogenic archaea (archaebacteria); a reduction of H2 production; a stimulation of H2 utilisation beneficial for the animal.
It is very important that the DNA of the same microorganisms (Delftia sp.; Mycobacteria sp.; Archaebacteria) was repeatedly found at different sites of the station in different years.
The sequence of enolase is highly conserved from archaebacteria to mammals [17].
Ivanov, "Halophilic archaebacteria from the Kalamkass oil field," Mikrobiologiya, vol.
Schaefer, "Thermoproteales: A novel type of extremely thermoacidophilic anaerobic archaebacteria isolated from Icelandic solfataras," Zentralblatt fur Bakteriologie.
Besides plants, AQPs were also found in creatures: archaebacteria, bacteria, fungus, animals etc.
Gastrointestinal microbiome is by far the largest reservoir of microbes in the human body, which contains about 1014 microbes; more than 99 % of the microbiota of the gastrointestinal tract is anaerobic bacteria, with fungi, protozoa, archaebacteria and other microorganisms (8-10).
Histone deacetylases (HDACs) are found in animals, plants, fungi, archaebacteria, and eubacteria [3].