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Archean

arc·hean

uncommon
noun (1) adjective (1)

noun

1.

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

adjective

1.

used of the earliest known rocks

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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.