Ichthyornis \Ich`thy*or"nis\, n. [NL., fr. Gr. 'ichqy`s, -y`os,
a fish + ? bird.] (Paleon.)
An extinct genus of toothed birds found in the American
Cretaceous formation. It is remarkable for having biconcave
vertebr[ae], and sharp, conical teeth set in sockets. Its
wings were well developed. It is the type of the order
{Odontotorm[ae]}.
[1913 Webster]