| Ornithochorie | ornithochory |
| Ornithologie | ornithology |
| Ornithologe | ornithologist |
| Ornithologin | ornithologist |
| Ornithopter | ornithopter |
| Ornithose | ornithosis |
| Orthodoxie | Orthodoxy |
| Xanthochromie | xanthrochromia xanthosis |
| Anemochorie | anemochory |
| Ornithin | ornithine |
| ornithologisch | ornithological ornithologic |
| Litholatrie | litholatry |
| Orthorexie | orthorexia |
| Anthologie | anthology |
| Orthoepie | orthoepy |
| Orthografie | orthography spelling |
| Orthopädie | orthopaedics orthoorthopedicsaedics |
| xanthochrom | xanthochromic |
| Epitrochoide | epitrochoid |
| Notochorda | notochord |