brother-in-law

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brother-in-law [noun]

the husband of your sister or brother, or the brother of your husband or wife, or the man who is married to the sister or brother of your wife or husband

US /ˈbrʌð.ɚ.ɪn.lɑː/ 
UK /ˈbrʌð.ə.rɪn.lɔː/ 

Oxford Essential Dictionary

brother-in-law

 noun (plural brothers-in-law)

1 the brother of your wife or husband

2 the husband of your sister
Look at sister-in-law.

Longman Dictionary of Contemporary English

brother-in-law

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

Oxford Advanced Learner's Dictionary

brother-in-law

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

compare  sister-in-law

Cambridge Advanced Learner's Dictionary

ˈ brother-in-law / ˈbrʌð.ə.rɪn.lɔː /   / -ɚ.ɪn.lɑː / noun [ C ] ( plural brothers-in-law )

B2 the husband of your sister or brother, or the brother of your husband or wife, or the man who is married to the sister or brother of your wife or husband

Collins Advanced Learner’s English Dictionary

brother-in-law

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

Merriam-Webster's Advanced Learner's Dictionary

brother-in-law
 

broth·er–in–law /ˈbrʌðɚrənˌlɑː/ noun, pl broth·ers–in–law /ˈbrʌðɚzənˌlɑː/ [count]
1 : the brother of your husband or wife
2 : the husband of your sister