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Webster's New World College Dictionary » Ordovician
Ordovician
Ordovician definition
Or·do·vi·cian (ôr′də vis̸h′ən)
adjective
designating or of the second geologic period of the Paleozoic Era, characterized by the development of abundant marine invertebrates and the first vertebrates
Etymology: < L Ordovices, ancient Celtic tribe in Wales
Ordovician Idioms
the Ordovician
the Ordovician Period or its rocks
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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