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English Dictionary: Ordovician period by the DICT Development Group
1 result for Ordovician period
From WordNet (r) 3.0 (2006) [wn]:
Ordovician period
n
  1. from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
    Synonym(s): Ordovician, Ordovician period
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