Definition of Hadean in US English:

Hadean

adjective

  • 1Greek Mythology
    Relating to or characteristic of Hades, the underworld of the dead.

    ‘he was condemned to a Hadean eternity’
  • 2Geology
    Relating to or denoting the period when the earth was forming.

    ‘a new analysis of Hadean mineralogy’
    ‘the turmoil of the rock cycle since the Hadean’

Pronunciation

Hadean

/ˈheɪdiən//ˈhādēən/