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Definition of: Ordovician
(ôr′də·vish′ən) adjective
1. Geol. Of, pertaining to, or designating a geological period of the Paleozoic era, following the Cambrian and preceding the Silurian.
2. Of or pertaining to the Ordovices.
—noun An epoch of the Paleozoic era: sometimes called Lower Silurian. [<L Ordovices the Ordovices]
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