| Oxidationszahl | oxidation number |
| Oxidationsflamme | oxidizing flame |
| Oxidation | oxidation |
| Oxidationsmittel | oxidant |
| Operationssaal | operating room theatre operating theater operating theatre surgery theater |
| Oxydation | oxidation |
| Ordinationsraum | surgery |
| motivational | motivational |
| Nidation | nidation |
| Animationsfilm | animated cartoon |
| Sensationsmache | sensationalism |
| Ionisationsröhre | ionisation tube ionization tube |
| Ionisationsstab | ionization bar ionizing bar |
| Isolationshaft | solitary confinement |
| Kombinationszange | combination pliers engineers pliers |
| arational | arational |
| irrational | irrational |
| national | national |
| rational | rational |
| relational | relational |