archean | ||
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_era archeozoic archeozoic_era archaeozoic | |
Related terms: | era Precambrian | |
2. | [ noun ] (geology) the time from 1.5 billion to 5 billion years ago; earth's crust formed; unicellular organisms are earliest forms of life | |
Synonyms: | Archaeozoic Archeozoic_era Archaeozoic_era archaeozoic_aeon archean_aeon archean_eon archeozoic_eon Archeozoic | |
Related terms: | eon era Precambrian | |
3. | [ adjective ] (geology) used of the earliest known rocks | |
Synonyms: | archaean | |
Related terms: | geology early | |
Similar spelling: |
archaean archangel arching archine Arcand archness arcanum arrogant Arkansas Arkansan arachnid |