plural noun, singular archaebacterium [ahr-kee-bak-teer-ee-uhm] .
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] .

1977; < Neo-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. 2014.
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World English Dictionary
archaebacteria (ˌɑːkɪbækˈtɪərɪə)
pl n
See archaean (formerly) a group of microorganisms now regarded as members of the Archaea
[from archaeo- + bacteria]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

pl. of archaebacterium (1977), from archaeo-, from Gk. arkhaios "ancient," from arkhe "beginning" (see archon) + bacterium (see bacteria).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
archaebacterium   (är'kē-bāk-tîr'ē-əm)  Pronunciation Key 
Plural archaebacteria
See archaeon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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