Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of ordovician is as below...

Ordovician :: Ordovician (a.) Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian..

Ordovician :: Ordovician (n.) The Ordovician formation.

Ordovian :: Ordovian (a. & n.) Ordovician.

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