mother-in-law

noun
moth·​er-in-law | \ˈmə-t͟hər-ən-ˌlȯ, ˈmət͟h-rən-, ˈmə-t͟hərn-\
plural mothers-in-law\ˈmə-​t͟hər-​zən-​ \

Definition of mother-in-law 

1 : the mother of one's spouse

2 archaic : stepmother

First Known Use of mother-in-law

14th century, in the meaning defined at sense 1

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Time Traveler for mother-in-law

The first known use of mother-in-law was in the 14th century

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More Definitions for mother-in-law

mother-in-law

noun

English Language Learners Definition of mother-in-law

: the mother of your husband or wife

mother-in-law

noun
moth·​er-in-law | \ˈmə-t͟hər-ən-ˌlȯ\
plural mothers-in-law

Kids Definition of mother-in-law

: the mother of someone's husband or wife

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More from Merriam-Webster on mother-in-law

Rhyming Dictionary: Words that rhyme with mother-in-law

Spanish Central: Translation of mother-in-law

Nglish: Translation of mother-in-law for Spanish Speakers

Britannica English: Translation of mother-in-law for Arabic Speakers

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