Definitions of Hadean
  1. noun
    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
    synonyms: Hadean aeon, Hadean eon, Hadean time, Priscoan, Priscoan aeon, Priscoan eon
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    example of:
    aeon, eon
    the longest division of geological time
  2. adjective
    of or relating to or characteristic of Hades or Tartarus
    synonyms: Plutonian, Tartarean
    being of the underworld
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