| Singular | Plural | |
|---|---|---|
| Nominativ | armillum, armillom | armillaeque, armilla |
| Genitiv | armilli | armillorum, armillum |
| Dativ | armillo | armillis, armillisque |
| Akkusativ | armillum | armilla, armillaeque |
| Ablativ | armillo | armillis, armillisque |
| Vokativ | armillum | armilla, armillaeque |