mother-in-law

noun

moth·​er-in-law ˈmə-t͟hər-ən-ˌlȯ How to pronounce mother-in-law (audio)
ˈmət͟h-rən-, 
ˈmə-t͟hərn-
plural mothers-in-law ˈmə-t͟hər-zən-ˌlȯ How to pronounce mother-in-law (audio)
1
: the mother of one's spouse
2
archaic : stepmother

Examples of mother-in-law in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Clancy's mother, mother-in-law, sister, friends and co-workers testified that Clancy struggled with her mental health after giving birth to Callan, the youngest of her three children. — ABC News, 3 Sep. 2026 My mother-in-law is the queen of anti-aging serums, and the Sonage Collagen Boosting Serum is one of her favorites. — Cheryl Wagemann, InStyle, 3 Sep. 2026 Now, her husband and mother-in-law have been charged in connection with her death. — Raven Brunner, PEOPLE, 3 Sep. 2026 Her taste is significantly better than that of my mother-in-law and the other dama. — Jonathan Flint, Harpers Magazine, 1 Sep. 2026 See All Example Sentences for mother-in-law

Word History

First Known Use

14th century, in the meaning defined at sense 1

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

Rhymes for mother-in-law

See All Rhymes for mother-in-law

Browse Nearby Words

Mothering Sunday
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Cite this Entry

“Mother-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mother-in-law. Accessed 7 Sep. 2026.

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Kids Definition

mother-in-law

noun
moth·​er-in-law
ˈmət͟h-(ə-)rən-ˌlȯ, 
ˈmət͟h-ərn-ˌlȯ
plural mothers-in-law
ˈmət͟h-ər-zən-
: the mother of one's husband or wife
Last Updated: - Updated example sentences
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