Meaning & use
Hadean
Relating to the earliest eon of Earth's history, roughly 4.6 to 4 billion years ago.
See it in a sentence
During the Hadean eon, Earth's surface was likely molten and unable to support life.
Scientists study Hadean-era zircon crystals to learn about the planet's first oceans.
A note on using this word
Hadean comes from Hades, reflecting the hellish, molten conditions thought to have covered early Earth.
Words with a similar meaning
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