priscoan eon

1 definition found

priscoan eon - WordNet (r) 2.1 (2005) :

  Priscoan eon
      n 1: the earliest eon in the history of the Earth from the first
           accretion of planetary material (around 4,600 million years
           ago) until the date of the oldest known rocks (about 3,800
           million years ago); no evidence of life [syn: Hadean,
           Hadean time, Hadean eon, Hadean aeon, Priscoan,
           Priscoan eon, Priscoan aeon]