Definition of Ichthyornis
: the type genus of Ichthyornithidae comprising extinct birds of the Upper Cretaceous that have biconcave vertebrae, articulated quadrate bones, sharp conical teeth set in sockets, well-developed wings, and a keeled sternum and that are similar in size and probably in habits to a tern
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Origin and Etymology of ichthyornis
New Latin, from ichthy- + -ornis
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