| Singular | Plural | |
|---|---|---|
| Nominativ | amphithalamos | amphithalami, amphithalamoe |
| Genitiv | amphithalami | amphithalamorum, amphithalamum |
| Dativ | amphithalamo | amphithalamis |
| Akkusativ | amphithalamum, amphithalamom, amphithalamon | amphithalamos |
| Ablativ | amphithalamo | amphithalamis |
| Vokativ | amphithalame | amphithalami |