-ˌȯrnəthəˈfȯrˌmēz, -_ȯrˌnith- noun plural
Usage: capitalized
Etymology: New Latin, from Ichthyornith-, Ichthyornis + -iformes
: an order of extinct toothed birds (superorder Odontognathae) coextensive with the family Ichthyornithidae in its broadest scope