ORDOVICIAN - Definition

Pronunciation:		`owrdu'viseeun
WordNet Dictionary

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

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	Synonyms:	Ordovician period

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

Webster's 1913 Dictionary

	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.