Definition of "Neoaves"

Neoaves

proper noun
1. Most modern birds, excluding Anseriformes (eg, ducks) and Galliformes (eg, chickens) and Paleognathae (eg, ostriches, rheas)
  1. A taxonomic clade within the superorder Neognathae.
  2. A taxonomic superorder within the infraclass Neognathae.