Noun archaeornithes has 1 sense
  1. Archaeornithes, subclass Archaeornithes - primitive reptile-like fossil birds of the Jurassic or early Cretaceous
    --1 is a kind of class
    --1 is a member of Aves, class Aves
    --1 has members:
     genus Archaeopteryx, genus Archeopteryx; genus Sinornis; genus Ibero-mesornis; genus Archaeornis
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