sister-in-law

noun6

1. •
   A female relative of one's generation, separated by one degree of marriage.
2. •
   The sister of one's spouse.

   • Though they are not twins, my sister-in-law resembles my wife in almost every way.
3. •
   The wife of one's sibling.

   • My sister-in-law and my brother met while they were both on vacation in Jamaica.
4. •
   Co-sister-in-law: The wife of one's sibling-in-law.
5. •
   The wife of the sibling of one's spouse.
6. •
   The sister of the spouse of one's sibling.