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variant spelling of archean


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ar·​chae·​an är-ˈkē-ən How to pronounce archaean (audio)
plural archaeans
: any of the microorganisms comprising the archaea
In earlier work on the mine ecosystem, these archaeans had gone undetected.Henry Nicholls
archaean adjective
archaean thermophiles
archaean species

Word History

First Known Use


1996, in the meaning defined above

Time Traveler
The first known use of Archaean was in 1996

Dictionary Entries Near Archaean

Cite this Entry

“Archaean.” Dictionary, Merriam-Webster, Accessed 30 Jan. 2023.

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