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Precambrian

Pre·cam·bri·an

Precambrian

 
pronunciation:
pri kaem bri n
parts of speech:
adjective, noun
part of speech: adjective
definition: of, relating to, or designating the earliest geological era, ending approximately 600 million years ago, when the earth's crust was formed and the first evidence of life appeared.
 
part of speech: noun
definition: the Precambrian Era, or the rock formations that date from that time.