In some of the non-Latin-based languages that I know there is a special word for your brother's wife. Is there such a word in English?
Usage would be something like:
She is my __ (My brother's wife)
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That would be sister-in-law:
sister of one's spouse, the wife of one's brother, or sometimes the wife of one's spouse's brother.
Edit: as ShreevatsaR points out in the comments, if you're looking for a single word that means only "wife of one's brother" and nothing else, then you're out of luck.