Definition that contains ornith
- wilson Scottish ornithologist in the United States (1766-1813)
- platypus small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
- stegosaurus herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon
- ornithological of or relating to ornithology
- audubon United States ornithologist and artist (born in Haiti) noted for his paintings of birds of America (1785-1851)
- duckbill small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae
- steatornis type and sole genus of the family Steatornithidae
- genus ibero-mesornis a genus of fossil bird of the subclass Archaeornithes
- alexander wilson Scottish ornithologist in the United States (1766-1813)
- citrulline an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine