ichthyosaur

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ich·thy·o·saur / ˈik[unvoicedth]ēəˌsôr/ (also ichthyosaurus / ˌik[unvoicedth]ēəˈsôrəs/ ) • n. an extinct marine reptile (order Ichthyosauria) of the Mesozoic era resembling a dolphin, with a long pointed head, four flippers, and a vertical tail.DERIVATIVES: ich·thy·o·sau·ri·an / ˌik[unvoicedth]ēəˈsôrēən/ adj.

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