(n.) The sister of one's husband or wife; also, the wife of one's brother; sometimes, the wife of one's husband's or wife's brother.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sister-in-law. Retrieved October 1, 2026, from http://smartdefine.org/sister-in-law/definitions/2062428 |
| Chicago | Webster's. 2011. "sister-in-law" http://smartdefine.org/sister-in-law/definitions/2062428 (accessed October 1, 2026). |
| Harvard | Webster's 2011, sister-in-law, Smart Define, viewed 1 October, 2026, <http://smartdefine.org/sister-in-law/definitions/2062428>. |
| MLA | Webster's. "sister-in-law" 28 May 2011. Web. 1 October 2026. <http://smartdefine.org/sister-in-law/definitions/2062428> |