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sis·ter-in-law (sĭstər-ĭn-lô′)
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Tweet n. pl. sisters-in-law 1. The sister of one's spouse. 2. The wife of one's sibling. 3. The wife of the sibling of one's spouse. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
