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1. Oxford American Dictionary

   Archean

   • IPA[ärˈkēən]

   美式

   • adj.
     relating to or denoting the eon that constitutes the earlier (or middle) part of the Precambrian, in which there was no life on the earth. It precedes the Proterozoic eon and (in some schemes) is preceded by the Priscoan eon.
   • n.
     the eon that constitutes the earlier (or middle) part of the Precambrian eon, or the system of rocks deposited during it
2. • 釋義

   adj.

   形容詞

   • 1. relating to or denoting the eon that constitutes the earlier (or middle) part of the Precambrian, in which there was no life on the earth. It precedes the Proterozoic eon and (in some schemes) is preceded by the Priscoan eon. the main basement rocks are Archeangneiss

   n.

   名詞

   • 1. the eon that constitutes the earlier (or middle) part of the Precambrian eon, or the system of rocks deposited during it these organisms evolved sometime near the onset of the Archean