ORDOVICIAN

Ordovician, Ordovician period

(noun) from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds

Source: WordNet® 3.1

Or`do*vi"cian, a. Etym: [From L. Ordovices, a Celtic people in Wales.] (Geol.)

Definition: 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.

Definition: The Ordovician formation.

Source: Webster’s Unabridged Dictionary 1913 Edition

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