sister-in-law

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sister-in-law [noun]

the wife of your brother or sister, or the sister of your husband or wife, or the wife of the brother or sister of your husband or wife

US /ˈsɪs.tɚ.ɪn.lɑː/ 
UK /ˈsɪs.tə.rɪn.lɔː/ 

Oxford Essential Dictionary

sister-in-law

 noun (plural sisters-in-law)

1 the sister of your wife or husband

2 the wife of your brother

Longman Dictionary of Contemporary English

sister-in-law

ˈsister-in-ˌlaw BrE AmE noun (plural sisters-in-law) [countable]
1. the sister of your husband or wife
2. your brother’s wife
3. the wife of the brother of your husband or wife

Oxford Advanced Learner's Dictionary

sister-in-law

ˈsister-in-law [sister-in-law sisters-in-law]       noun (pl. sisters-in-law)
the sister of your husband or wife; your brother's wife; the wife of your husband or wife's brother

compare  brother-in-law

Collins Advanced Learner’s English Dictionary

sister-in-law

 sisters-in-law
 N-COUNT: oft poss N
 Someone's sister-in-law is the sister of their husband or wife, or the woman who is married to their brother.

Merriam-Webster's Advanced Learner's Dictionary

sister-in-law

 

sis·ter–in–law /ˈsɪstɚrənˌlɑː/ noun, pl sis·ters–in–law /ˈsɪstɚzənˌlɑ/ [count]
1 : the sister of your husband or wife
2 : the wife of your brother