From Proto-Finnic *onci, from Proto-Finno-Ugric *omte (“cavity”) or *oŋte. Cognate with Veps onduz, Erzya ундо (undo, “hole, cavity, hollow”)[1] and Hungarian odú (“haunt, animal hole”).
onsi (rare)
| Inflection of onsi (Kotus type 28*J/kynsi, nt-nn gradation) | |||
|---|---|---|---|
| nominative | onsi | onnet | |
| genitive | onnen | onsien | |
| partitive | ontta | onsia | |
| illative | onteen | onsiin | |
| singular | plural | ||
| nominative | onsi | onnet | |
| accusative | nom. | onsi | onnet |
| gen. | onnen | ||
| genitive | onnen | onsien ontten rare | |
| partitive | ontta | onsia | |
| inessive | onnessa | onsissa | |
| elative | onnesta | onsista | |
| illative | onteen | onsiin | |
| adessive | onnella | onsilla | |
| ablative | onnelta | onsilta | |
| allative | onnelle | onsille | |
| essive | ontena | onsina | |
| translative | onneksi | onsiksi | |
| abessive | onnetta | onsitta | |
| instructive | — | onsin | |
| comitative | See the possessive forms below. | ||