Search Result：archean eon
archean eon 
(TTS Sound)
(TTS Sound)Overview of noun archean_eon
The noun archean eon has 1 sense
- Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon -- (the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life)