ichthyosaur

/ˈɪkθiəsɔːɹ/

IPA: /IH1 CH T AY1 AH0 S AO1 R/

noun
  1. 1

    Any of several fishlike marine reptiles of the extinct order Ichthyosauria of the early Triassic to the late Cretaceous period, that had a body somewhat like a porpoise.

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