archaebacterium

noun
ar·​chae·​bac·​te·​ri·​um | \ˌär-kē-ˌbak-ˈtir-ē-əm \

Definition of archaebacterium 

: any of the microorganisms comprising the archaea

First Known Use of archaebacterium

1977, in the meaning defined above

History and Etymology for archaebacterium

New Latin

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The first known use of archaebacterium was in 1977

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