adj.
1.of or relating to or characteristic of Hades or Tartarus hadean n.
1.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)
Idiom of the Day
an open secret
a secret that so many people know about that it is no longer a secret
It is an open secret that I will be leaving my company next month.