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archean
 
Adjective archean has 1 sense
  1. archean, archaean - used of the earliest known rocks
    Antonym: middle (indirect, via late, early)
    Antonym: late (indirect, via early, middle)
Noun archean has 1 sense
  1. Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
    --1 is a kind of eon, aeon
    --1 is a part of
     Precambrian, Precambrian eon, Precambrian aeon, Precambrian period
archdiocesan archdiocese archducal archduchess archduchy archduke arche archealogy archean archean aeon archean eon arched archegonial archegoniate archegonium archelies archelon

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