Definitions for ichthyosauria
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Princeton's WordNet
Ichthyosauria, order Ichthyosauria(noun)
extinct marine reptiles: ichthyosaurs
Webster Dictionary
Ichthyosauria(u)
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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"ichthyosauria." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/ichthyosauria>.