| Pronunciation: | | `owrdu'viseeun
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 WordNet Dictionary |
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| | Definition: | |
[n] from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds |
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ORDOVICIAN is a 10 letter word that starts with O. |
| | Synonyms: | | Ordovician period |
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| | See Also: | | geological period, Paleozoic, Paleozoic era, period |
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| Webster's 1913 Dictionary |
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| | 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.
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