archaebacterium
arc·hae·bac·terium
noun
1.
considered ancient life forms that evolved separately from bacteria and blue-green algae
Origin
From Ancient Greek ᾰ̓ρχαῖος (ărkhaîos, “ancient”) + English bacterium.
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Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.