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Noun: Precambrian period
  1. The eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
    - Precambrian, Precambrian eon, Precambrian aeon

Type of: aeon, eon

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prearrangement
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prebend
prebendal
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Precambrian
Precambrian aeon
Precambrian eon
Precambrian period
precancerous
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precautionary