snaja

1. (son's wife) daughter-in-law
   Svekrva i snaja se odlično slažu. — The mother-in-law and daughter-in-law get along great.
   Naša snaja je iz Novog Sada. — Our daughter-in-law is from Novi Sad.
2. (brother's wife) sister-in-law
   Brat i snaja dolaze kod nas za vikend. — My brother and sister-in-law are coming over for the weekend.

In Serbia snaha is also common; the affectionate form snajka is used as a form of address.