Archean

adjective
Ar·che·an | \är-ˈkē-ən \
variants: or Archaean

Definition of Archean 

1 : of, relating to, or being the earliest eon of geological history or the corresponding system of rocks — see Geologic Time Table

Other Words from Archean

Archean noun

First Known Use of Archean

1872, in the meaning defined at sense 1

History and Etymology for Archean

Greek archaios

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The first known use of Archean was in 1872

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