| Singular | Plural | |
|---|---|---|
| Nominativ | claustrom, claustrum | claustra, claustraliter, claustraque |
| Genitiv | claustri | claustrorum |
| Dativ | claustro | claustris, claustrisque |
| Akkusativ | claustrum | claustra, claustraliter, claustraque |
| Ablativ | claustro | claustris, claustrisque |
| Vokativ | claustrum | claustra, claustraliter, claustraque |