hadean

Noun
  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 (synset 115154524)
    is an instance of: aeon, eon - the longest division of geological time
    same as: hadean aeon, hadean eon, hadean time, priscoan, priscoan aeon, priscoan eon
Adjective
  1. Of or relating to or characteristic of Hades or Tartarus (synset 301307016)
    similar to: infernal - being of the underworld
    same as: plutonian, tartarean

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