| 释义 |
HadeanenUK
Ha·de·an H0006450 (hā-dē′ən, hā′dē-)adj. 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). See Table at geologic time.
[After Hades, (from the intense heat during part of this period).]Thesaurus| Noun | 1. | Hadean - 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 lifeHadean aeon, Hadean eon, Hadean time, Priscoan, Priscoan aeon, Priscoan eon | | Adj. | 1. | Hadean - of or relating to or characteristic of Hades or TartarusPlutonian, Tartareaninfernal - being of the underworld; "infernal regions" |
TranslationsHadeanenUK
Hadean[′hā·dē·ən] (geology) The period (more than 3800 million years ago) extending for several hundred millions of years from the end of the accretion of the earth to the formation of the oldest recognized rocks. HadeanenUK
Related to Hadean: ArcheanSynonyms for Hadeannoun 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)Synonyms- Hadean aeon
- Hadean eon
- Hadean time
- Priscoan
- Priscoan aeon
- Priscoan eon
adj of or relating to or characteristic of Hades or TartarusSynonymsRelated Words |