| Orthohelium | orthohelium |
| Orthorexie | orthorexia |
| Orthodoxie | Orthodoxy |
| Orthoklas | orthoclase |
| Tortonium | Tortonian |
| dortherum | thereabout |
| Orthoepie | orthoepy |
| Orthoptist | orthoptist |
| Orthopädie | orthopaedics orthoorthopedicsaedics |
| Orthopädin | orthopaedic specialist orthopaedist orthopedic specialist orthopedist |
| Bathonium | Bathonian |
| Thorium | thorium |
| Hohelied | Song of Songs Song of Solomon |
| Gzhelium | Gzhelian |
| Helium | helium |
| Rupelium | Rupelian |
| Nobelium | nobelium |
| Thallium | thallium |
| Thulium | thulium |
| Oratorium | oratory |