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-arch
Arch.
arch (1)
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Archaean
archaebacteria
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archaea

ar·chae·a [ aar k ə, rkee ə ]


plural noun 
Definition:
 
primitive single-celled organisms: members of one of two distinct groups of the most primitive living single-celled organisms, similar in size to bacteria but different in molecular organization

[Late 20th century. Shortening of archaebacteria]
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