precambrian_period
1. [ noun ] (geology) 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_aeon precambrian_eon Precambrian
Related terms: geological_time era eon Archeozoic archaeozoic Proterozoic
Similar spelling:   precambrian_eon
  precambrian_aeon