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_eon hadean_time priscoan priscoan_aeon priscoan_eon hadean_aeon
Related terms: eon
2. [ adjective ] of or relating to or characteristic of Hades or Tartarus
Synonyms: Tartarean Plutonian
Related terms: infernal
Similar spelling:   Haydn
  Haden
  Haydon
  Hayden
  Haddon
  Hadden
  Haitian