Ordovician

Ordovician

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Ordovician

Source: The Collaborative International Dictionary of English v.0.48

	Ordovician \Or`do*vi"cian\, a. [From L. Ordovices, a Celtic
   people in Wales.] (Geol.)
   Of or pertaining to a division of the Silurian formation,
   corresponding in general to the Lower Silurian of most
   authors, exclusive of the Cambrian. -- n. The Ordovician
   formation.
   [1913 Webster]

Source: WordNet (r) 2.0

	Ordovician
     n : from 500 million to 425 million years ago; conodonts and
         ostracods and algae and seaweeds [syn: Ordovician period]

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