Definitions for: Ordovician

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

Webster (1913) Definition: 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.

Synonyms: Ordovician period

See Also: geological period, Paleozoic, Paleozoic era, period

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