‖Ich′thy‐o‐sau″ri‐a (?), n. pl. [NL. See Ichthyosaurus.] (Paleon.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; — called also Ichthyopterygia. They have not been found later than the Cretaceous period.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.