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Archaean

[ahr-kee-uh n] /ɑrˈki ən/
adjective, Geology
1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Archaean

archaean

/ɑːˈkɪən/
noun
1.
any member of the Archaea, a domain of prokaryotic microorganisms, distinguished from bacteria on molecular phylogenetic grounds and often found in hostile environments, such as volcanic vents and hot springs

Archaean

/ɑːˈkiːən/
adjective
1.
of or relating to the highly metamorphosed rocks formed in the early Precambrian era
2.
the earlier of two divisions of the Precambrian era, during which the earliest forms of life are assumed to have appeared
Compare Proterozoic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for Archaean
adj.

"of the earliest geological age," 1872, from Greek arkhaios "ancient," from arkhe "beginning" (see archon).

Online Etymology Dictionary, © 2010 Douglas Harper
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Archaean in Science
Archaean
  (är-kē'ən)   
Another spelling of Archean.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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