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Ordovician period

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Ordovician periodOrdovician period - from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
Ordovician
Paleozoic, Paleozoic era - from 544 million to about 230 million years ago


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