Definition of

Archean

  1. (noun, time) the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
  2. (adj, all) of or relating to the earliest known rocks formed during the Precambrian Eon

via WordNet, Princeton University

Alternate forms of Archean

Derivations: archean

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