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Precambrian (adj.)

also Pre-Cambrian, 1861, from pre- + Cambrian.

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Definitions of Precambrian from WordNet

Precambrian (n.)
the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago;
Synonyms: Precambrian eon / Precambrian aeon / Precambrian period
From wordnet.princeton.edu