sis·ter-in-law /ˈsɪst(ə)rənˌlɔ, tɚ/
姑子;弟媳
Sis·ter-in-law n.; pl. Sisters-in-law 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.
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sister-in-law
n : the sister of your spouse
[also: sisters-in-law (pl)]