Archean

adjective

Ar·​che·​an är-ˈkē-ən 

variants or Archaean

1

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

2

: precambrian

Archean noun

Word History

Etymology

Greek archaios

First Known Use

1872, in the meaning defined at sense 1

Kids Definition

Archean

adjective

Ar·​che·​an

variants or Archaean

är-ˈke-ən 

: of, relating to, or being the earliest eon of geological history or the corresponding system of rocks see geologic time

Archean noun