- 1. Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
- usage: the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. archeozoic, archaeozoic, early (vs. middle) (vs. late)
- usage: of or belonging to earlier of two divisions of the Precambrian era; "archeozoic life forms"
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See also: archeozoic (Dictionary)