Noun precambrian eon has 1 sense
  1. Precambrian, Precambrian eon, Precambrian aeon, Precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
    --1 is a kind of eon, aeon
    --1 has parts:
     Proterozoic, Proterozoic eon, Proterozoic aeon; Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
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