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