Archaea

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Translingual[edit]

Alternative forms[edit]

Etymology[edit]

From Ancient Greek ἀρχαῖα (arkhaîa, ancient), neuter plural of ἀρχαῖος (arkhaîos, ancient).

Proper noun[edit]

Archaea

  1. A taxonomic domain of single-celled organisms lacking nuclei, formerly called archaebacteria but now known to differ fundamentally from bacteria.

Usage notes[edit]

Whereas in the three-domain system the Archaea comprise a domain, in the short-lived two-empire system they were a kingdom in the domain (or "empire") Prokaryota.

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