WordRel.com

• 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

  synonym	Hadean aeonHadean eonHadean timePriscoanPriscoan aeonPriscoan eon
  instance hypernym	aeoneon

• of or relating to or characteristic of Hades or Tartarus

  synonym	PlutonianTartarean
  derivation	Hades
  similar	infernal