ˌärkēˈȯrnə̇s noun
Etymology: New Latin, from archae- + -ornis
1. capitalized : a genus of Upper Jurassic birds (subclass Archaeornithes) having a long feathered tail, showing reptilian characteristics in the absence of a bill, presence of teeth in the jaws, and on the wings three free digits with claws
2. -es : a bird or fossil of the genus Archaeornis