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[ahr-kee-bak-teer-ee-uh] /ˌɑr ki bækˈtɪər i ə/
plural noun, singular archaebacterium
[ahr-kee-bak-teer-ee-uh m] /ˌɑr ki bækˈtɪər i əm/ (Show IPA)
a group of microorganisms, including the methanogens and certain halophiles and thermoacidophiles, that have RNA sequences, coenzymes, and a cell wall composition that are different from all other organisms: considered to be an ancient form of life that evolved separately from the bacteria and blue-green algae and sometimes classified as a kingdom.
Also, archaeobacteria
[ahr-kee-oh-bak-teer-ee-uh] /ˌɑr ki oʊ bækˈtɪər i ə/ (Show IPA)
Origin of archaebacteria
1977; < New Latin, equivalent to archae-, irregular for archaeo- archaeo- (perhaps an erroneous Latinizing of Greek arche- arche-) + bacteria bacteria Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for archaebacteria


plural noun
(formerly) a group of microorganisms now regarded as members of the Archaea See archaean
Word Origin
from archaeo- + bacteria
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for archaebacteria

plural of archaebacterium (1977), from archaeo- + bacterium (see bacteria).

Online Etymology Dictionary, © 2010 Douglas Harper
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archaebacteria in Science
Plural archaebacteria
See archaeon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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