Definition of mother-in-law noun from the Oxford Advanced Learner's Dictionary

 

mother-in-law

 noun
noun
BrE BrE//ˈmʌðər ɪn lɔː//
 
; NAmE NAmE//ˈmʌðər ɪn lɔː//
 
(pl. mothers-in-law) Marriage, Relations
 
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the mother of your husband or wife The comedian told an endless stream of mother-in-law jokes. compare father-in-law See related entries: Marriage, Relations
See the Oxford Advanced American Dictionary entry: mother-in-law