hadean Meaning, Definition & Usage

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
   Priscoan; Hadean aeon; Hadean time; Hadean eon; Priscoan aeon; Priscoan eon.
   
2. adjective satellite of or relating to or characteristic of Hades or Tartarus
   Plutonian; Tartarean.
   

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