‖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. [ 1913 Webster ]
‖n.; pl.Ichthyosauri [ NL., fr. Gr. 'ichqy`s, -y`os, a fish + say^ros a lizard. ] (Paleon.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebræ, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oölitic, and Cretaceous formations. [ 1913 Webster ]
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