Hesperornithiformes
plural noun
Hes·per·or·nith·i·for·mes
ˌhespə(ˌ)rȯrˌnithəˈfȯrˌmēz
: an order of extinct aquatic birds (superorder Odontognathae) including the genus Hesperornis and related Cretaceous forms
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Merriam-Webster unabridged
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