-ˌȯrˈnithəˌdē noun plural
Usage: capitalized
Etymology: New Latin, from Ichthyornith-, Ichthyornis, type genus + -idae
: a family of extinct birds (order Ichthyornithiformes) from the Upper Cretaceous of No. America that comprises the genus Ichthyornis and in some classifications Apatornis and possibly one other genus