sister-in-law

käly, nato A female relative of one's generation, separated by one degree of marriage:
The sister of one's spouse.
The wife of one's sibling.
puhekieltä co-sister-in-law Co-sister-in-law: The wife of one's sibling-in-law.
The wife of the child of one's spouse.
The sister of the spouse of one's sibling.