| euronithopod | (noun) widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) | Synonyms: Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda |
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| ornithine | (noun) an amino acid that does not occur in proteins but is important in the formation of urea | - |
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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| ornithological | (adjective) of or relating to ornithology | - |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| ornithology | (noun) the branch of zoology that studies birds | - |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| ornithopod | (noun) bipedal herbivorous dinosaur | Synonyms: ornithopod dinosaur |
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| ornithopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: orthopter |
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| ornithosis | (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: parrot fever, psittacosis |
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| palaeornithology | (noun) the paleobiology of birds | Synonyms: paleornithology |
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| paleornithology | (noun) the paleobiology of birds | Synonyms: palaeornithology |
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| zenith | (noun) the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected | - |
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| zenithal | (adjective) relating to or located at or near the zenith | - |
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