Hadean Meaning 1 : of or relating to or characteristic of Hades or Tartarus

    Synonyms : plutonian,  tartarean

Hadean Meaning 2 : 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

• Other English words starting with Letter HA