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| cot·y·lo·saur [ kótt'lə sàwr ] (plural cot·y·lo·saurs) |
noun |
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| Definition: |
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extinct reptile: an extinct reptile with a heavy body and short legs, probably the first land vertebrate. Order Cotylosauria.
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| [Early 20th century. < Greek kotulē "cup" + sauros "lizard"] |
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