Formal:
* Bhabhi: This is the most common and respectful way to address your younger brother's wife.
* Shrimati [last name]: This is a more formal way to address her, especially if you are older than her or if you don't know her well.
Informal:
* [Name]: If you are close to her, you can simply call her by her name.
* Bhabhiji: This is a slightly more informal version of "Bhabhi".
Other:
* [Brother's name] ki patni: This literally translates to "[Brother's name]'s wife" and is a way to refer to her without using a specific term.
Important Note: The choice of how to address your brother's wife will depend on your relationship with her and your family's cultural norms. It's always a good idea to ask your brother how he prefers you to address his wife.