Likely a variant of -tu.
-matu (genitive -matu, partitive -matut, comparative -matum, superlative kõige -matum)
| Declension of -matu (ÕS type 1/ohutu, no gradation) | |||
|---|---|---|---|
| singular | plural | ||
| nominative | -matu | -matud | |
| accusative | nom. | ||
| gen. | -matu | ||
| genitive | -matute | ||
| partitive | -matut | -matuid | |
| illative | -matusse | -matutesse -matuisse | |
| inessive | -matus | -matutes -matuis | |
| elative | -matust | -matutest -matuist | |
| allative | -matule | -matutele -matuile | |
| adessive | -matul | -matutel -matuil | |
| ablative | -matult | -matutelt -matuilt | |
| translative | -matuks | -matuteks -matuiks | |
| terminative | -matuni | -matuteni | |
| essive | -matuna | -matutena | |
| abessive | -matuta | -matuteta | |
| comitative | -matuga | -matutega | |