| Singular | sinus; sīnus |
| Plural | sinūs; sīnī |
| Singular | sinūs; sīnī |
| Plural | sinuum; sīnōrum |
| Singular | sinuī; sīnō |
| Plural | sinibus; sīnīs |
| Singular | sinum; sīnum |
| Plural | sinūs; sīnōs |
| Singular | sinū; sīnō |
| Plural | sinibus; sīnīs |
| Singular | sinus; sīne |
| Plural | sinūs; sīnī |