Archean

Archean
or Archaean adjective Etymology: Greek archaios Date: 1872 1. of, relating to, or being the earliest eon of geological history or the corresponding system of rocks — see geologic time table 2. PrecambrianArchean noun

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Archean — [är kē′ən] adj. [< Gr archaios, ARCHAIC] [sometimes a ] designating or of the geologic eon characterized by the development of the first igneous and metamorphic rocks and the first marine microorganisms; Precambrian, esp. early Precambrian… …   English World dictionary

  • Archean — The Archean (pronEng|ɑrˈkiːən, also spelled Archaean, formerly called the Archaeozoic (IPA|/ɑrkiəˈzoʊɪk/), also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic and Paleoproterozoic, before 2.5 Ga (billion years ago, or… …   Wikipedia

  • Archean — …   Википедия

  • Archean — /ahr kee euhn/, adj. Geol. noting or pertaining to rocks of the Archeozoic portion of the Precambrian Era. Also, Archaean. [1870 75; < Gk archaî(os) ancient (see ARCHAEO ) + AN] * * * …   Universalium

  • archean — adj. (Geology) of or pertaining to the earliest known forms of rocks; of or belonging to the earlier of the two divisions of Precambrian time …   English contemporary dictionary

  • Archean — adjective US spelling of Archaean …   English new terms dictionary

  • archean — ar·che·an …   English syllables

  • Archean — Ar•che•an [[t]ɑrˈki ən[/t]] adj. gel of or pertaining to rocks of the Archeozoic portion of the Precambrian Era • Etymology: 1870–75 …   From formal English to slang

  • Archean — /aˈkiən/ (say ah keeuhn) noun, adjective → Archaean …   Australian English dictionary

  • archean — US var. of ARCHAEAN …   Useful english dictionary

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