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Definition of Ordovician
1. Noun. From 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds.
Group relationships: Paleozoic, Paleozoic Era
Generic synonyms: Geological Period, Period
Definition of Ordovician
1. a. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
Definition of Ordovician
1. Adjective. (geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago. ¹
2. Proper noun. (geology) The Ordovician period. ¹
¹ Source: wiktionary.com
Medical Definition of Ordovician
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Lexicographical Neighbors of Ordovician
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