sister-in-law
US /ˈsɪs.tər.ɪn.lɔː/
UK /ˈsɪs.tər.ɪn.lɔː/
1.
the sister of one's husband or wife
:
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My sister-in-law is coming to visit next week.
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She gets along very well with her sister-in-law.
2.
the wife of one's brother
:
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My brother and his sister-in-law are visiting from Canada.
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I bought a gift for my sister-in-law's birthday.