Archean aeon

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noun

the time from 3,800 million years to 2,500 million years ago;
earth's crust formed;
unicellular organisms are earliest forms of life
• Syn:
Archean, Archean eon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
• Derivationally related forms:
archaeozoic (for: Archaeozoic), archeozoic (for: Archeozoic), archean (for: Archean)
• Instance Hypernyms:
eon, aeon
• Part Holonyms:
Precambrian, Precambrian eon, Precambrian aeon, Precambrian period