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Ordovician Twit Definition of Ordovician Share Definition of Ordovician on Facebook Digg:Definition of Ordovician! stumble Definition of Ordovician Bookmark Definition of Ordovician on Delicious submit Definition of Ordovician to reddit Bookmark Definition of Ordovician
proper noun 
  1. (geology) The Ordovician period.
adjective 
  1. (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago.
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