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Archean

Ar·che·an (Ar·chae·an)

Archean (Archaean)

 
pronunciation:
ar ki n
parts of speech:
adjective, noun
part of speech: adjective
definition: of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic.
 
part of speech: noun
definition: the Archean Period, or the rock formations that date from that time.