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| Or·do·vi·cian [ àwrdə vísh'n ] |
noun |
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| Definition: |
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geologic period: a period of geologic time, 495 million to 443 million years ago, during which primitive fish and other ocean organisms appeared
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| [Late 19th century. < Latin Ordovices, ancient Celtic people of N Wales] |
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 Or·do·vi·cian adjective |
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