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1. Oxford Dictionary

   pelycosaur

   • IPA[ˈpɛlɪkə(ʊ)sɔː]

   英式

   • n.
     a large fossil reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest.

   • noun: pelycosaur, plural noun: pelycosaurs