Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, relating to, or being the period of time during which Earth formed, from the start of the solar system (4.6 billion years ago) until accretion, impact, and cooling led to stable Earth-Moon orbits and the formation of the earliest rocks on Earth (3.8 billion years ago).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective geology Of, or relating to the geologic eon from about 4,600 to 3,800 million years ago; marked by the formation of the solar system, a stable Earth-Moon orbit and the first rocks.
  • noun geology The Hadean eon.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After Hades, (from the intense heat during part of this period).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ᾍδης (Hades)

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