archean

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• February 26. 2013 from wordnet.princeton.edu

  archean — noun — english

  the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life

• March 23. 2016 from wordnet.princeton.edu

  archean — adjective — english

  of or relating to the earliest known rocks formed during the Precambrian Eon