"hadean" in the noun sense
1. Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan eon, Priscoan aeon
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
"hadean" in the adjective sense
1. Hadean, Plutonian, Tartarean
of or relating to or characteristic of Hades or Tartarus
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