Odontornithes n. pl. : A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcae, Odontotormae, and Saururae.

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Taxonomy
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Defination from the web:
Odontornithes is an obsolete and disused taxonomic term proposed by O. C. Marsh for birds possessing teeth, notably the genera Hesperornis and ... In the present case, the Odontornithes are not a monophyletic assembly, and the fact of their possessing teeth proves nothing but that some birds ...