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| the·rap·sid [ thə rápsid ] (plural the·rap·sids) |
noun |
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| Definition: |
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extinct reptile: an extinct reptile of an order that lived during the Permian and Triassic periods. Many therapsids are thought to be ancestors of the mammals. Order Therapsida.
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| [Early 20th century. < modern Latin Therapsida< Greek thēr "wild animal" + hapsis "vault"] |
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