| Thermion | Nominativ, Singular | nominative case, singular | |
| Thermions | Genitiv, Singular | genitive case, singular | |
| Thermion | Dativ, Singular | dative case, singular | |
| Thermion | Akkusativ, Singular | accusative case, singular | |
| Thermionen | Nominativ, Plural | nominative case, plural | |
| Thermionen | Genitiv, Plural | genitive case, plural | |
| Thermionen | Dativ, Plural | dative case, plural | |
| Thermionen | Akkusativ, Plural | accusative case, plural |