| Singular | Plural | |
|---|---|---|
| Nominativ | arcuballista | arcuballistae |
| Genitiv | arcuballistae, arcuballistai | arcuballistum, arcuballistarum |
| Dativ | arcuballistae, arcuballistai | arcuballistabus, arcuballistis |
| Akkusativ | arcuballistam | arcuballistas |
| Ablativ | arcuballistad, arcuballista | arcuballistabus, arcuballistis |
| Vokativ | arcuballista | arcuballistae |