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archd.
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Archean
Ar·che·an [ aar k ən ] or Ar·chae·an [ aar k ən ]


noun 
Definition:
 
Archean eon: the earliest eon of geologic time, dating from about four billion years ago
[Late 19th century. < Greek arkhaios "old, ancient" + an2]

Ar·che·an adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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