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archean

adjectivenoun /ɑrkiən/ 3 syllables 7 letters Scrabble 12 WWF 13
Definitions
adjective

of or relating to the earliest known rocks formed during the Precambrian Eon

noun

the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life

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