English adjective: archean | |||
1. | archean of or relating to the earliest known rocks formed during the Precambrian Eon | ||
Synonyms | archaean | ||
Similar | early | ||
Domain category | geology | ||
Antonyms | late, middle | ||
English noun: Archean | |||
1. | Archean (time) the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life | ||
Synonyms | Archaeozoic, Archaeozoic aeon, Archean aeon, Archean eon, Archeozoic, Archeozoic eon | ||
Instance hypernym | aeon, eon | ||
Part meronym | Precambrian, Precambrian aeon, Precambrian eon, Precambrian period | ||