Ordovician period

/ˌˈɔrdəˌvɪʃən ˌpɪriəd/
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Other forms: Ordovician periods

Definitions of Ordovician period
  1. noun
    the period of geologic time from about 485 to 444 million years ago; the second period of the Paleozoic era
    synonyms: Ordovician
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    example of:
    geological period, period
    a unit of geological time during which a system of rocks formed
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