archaeornis

from WordNet (r) 3.0 (2006)

archaeornis
    n 1: extinct primitive toothed bird with a long feathered tail
         and three free clawed digits on each wing

from The Collaborative International Dictionary of English v.0.48

archaeornis \archaeornis\ n.
   1. an extinct primitive toothed bird with a long feathered
      tail and three free clawed digits on each wing.
      [WordNet 1.5]