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hesperornis

[hes-puh-rawr-nis] /ˌhɛs pəˈrɔr nɪs/
noun
1.
a toothed aquatic bird of the extinct genus Hesperornis, fossils of which are found in rocks of Cretaceous age in Kansas, having the rear legs modified for swimming and reaching a length of more than 4 feet (1.2 meters).
Origin
< New Latin (1872) < Greek Hésper(os) Hesperus + órnis bird
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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