Definition of sister-in-law in English:

sister-in-law

Line breaks: sister-in-law

noun (plural sisters-in-law)

1The sister of one’s wife or husband.
1.1The wife of one’s brother or brother-in-law.

Definition of sister-in-law in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal