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1. Oxford Dictionary

   dimetrodon

   • IPA[dʌɪˈmiːtrədɒn]

   英式

   • n.
     a large fossil carnivorous mammal-like reptile of the Permian period, with long spines on its back supporting a sail-like crest.

   • noun: dimetrodon, plural noun: dimetrodons

2. • 更多解釋

   dimetrodon

   • IPA[dīˈmetrəˌdän]

   美式

   • n.
     a large, carnivorous, synapsid fossil reptile of the Permian period, with long spines on its ...

   Oxford American Dictionary