-oi-
Finnish
editEtymology
editThe -i- has labialized the preceding -a- (initially only for back vowels, but the suffix has been later generalized for front vowels as well).
Interfix
edit-oi- (front vowel harmony variant -öi-, linguistic notation -Oi-)
- Alternative form of -i- (“plural marker”)
- kasassa - kasoissa ― in the pile - in the piles
Usage notes
edit- if the plural indicator is between two vowels it becomes -oj-
- kasan - kasojen ― of the pile - of the piles