"archaea." YourDictionary, n.d. Web. 22 October 2018. <http://www.yourdictionary.com/Archaea>.
archaea. (n.d.). Retrieved October 22nd, 2018, from http://www.yourdictionary.com/Archaea
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 ("empire") Prokaryota.
From Ancient Greek ἀρχαῖα (arkhaia, “ancient”), neuter plural of ἀρχαῖος (arkhaios, “ancient”).
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