edaphosaurus

/EH1 D AH0 F AH0 S AO1 R AH0 S/
noun
  1. 1

    Any of several dinosaurs of the family Edaphosauridae, from the Carboniferous and Permian periods, that had a distinctive dorsal sail or crest

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Source: https://en.wiktionary.org/wiki/edaphosaurus