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Hadean

ha·dean

UK/heɪˈdiːən/ US/ˈheɪ.diːən/ uncommon
noun (1) adjective (1)

noun

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); no evidence of life

Synonyms

adjective

1.

of or relating to or characteristic of Hades or Tartarus

Synonyms
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Origin

From Hades + -an, from Ancient Greek ᾍδης (Hāídēs). By surface analysis, had- + -e- + -an.

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Broader terms

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.