Hadean
adjective Etymology: Hades Date: 1984 of, relating to, or being the aeon of history between the formation of the solar system and the formation of the first rocks on the earth — see geologic time table • Hadean noun

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Hadean — chthonian, *infernal, Tartarean, stygian, hellish …   New Dictionary of Synonyms

  • Hadean — The Hadean (pronEng|ˈheɪdiən) is the geologic eon before the Archean. It started at Earth s formation about 4.6 billion years ago (4600 Ma), and ended roughly 3.8 billion years ago, though the latter date varies according to different sources.… …   Wikipedia

  • Hadean — /heɪˈdiən/ (say hay deeuhn), /ˈheɪdiən/ (say haydeeuhn) adjective 1. of or relating to Hades. 2. relating to the geological era stretching from the time of the earliest accretion of planetary material to form the earth and the formation of the… …   Australian English dictionary

  • Hadean — I noun 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 • Syn: ↑Hadean time …   Useful english dictionary

  • Hadean — 1. adjective 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. 2. noun The Hadean eon …   Wiktionary

  • hadean —   an eon of geologic time lasting from 4600m to 3800m years ago …   Geography glossary

  • hadean — ha·de·an …   English syllables

  • Hadean aeon — noun 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 • Syn: ↑Hadean,… …   Useful english dictionary

  • Hadean eon — noun 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 • Syn: ↑Hadean,… …   Useful english dictionary

  • Hadean time — noun 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 • Syn: ↑Hadean,… …   Useful english dictionary

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