archean_era | ||
1. | [ noun ] (geology) the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life | |
Synonyms: | archaeozoic_era archean archeozoic archeozoic_era archaeozoic | |
Related terms: | era Precambrian | |
Similar spelling: |
archean_eon archean_aeon archaean Archiannelida archenteron archiannelid |