The Collaborative International Dictionary of English v.0.48:

Euornithes \Eu`or*ni"thes\, n. pl. [NL., fr., Gr. e'y^ well + ?,
   ? a bird.] (Zo["o]l.)
   The division of Aves which includes all the typical birds, or
   all living birds except the penguins and birds of ostrichlike
   form.
   [1913 Webster]