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.
Thirteen months later, Wang allegedly used a knife to stab his wife, Linlin Guo, 41, and his mother-in-law, Beimin Cheng, inside their Kelobra Court home in Walnut Creek. Nate Gartrell, Mercury News, 30 Mar. 2026 The catalogue of eight plans is part of Boise’s housing agenda, which already allows ADUs — smaller, secondary homes attached or adjacent to a primary residence that are often called in-law or mother-in-law units — in nearly all zoning districts. Mark Dee march 27, Idaho Statesman, 27 Mar. 2026 According to prosecutors, Zeigler shot and killed his wife, Eunice, and mother-in-law, Virginia Edwards, after the store had closed for the day. Martin E. Comas, The Orlando Sentinel, 27 Mar. 2026 Russell — the devoted husband of Paige (Elle Chapman) — absorbs hornet stings and sharper barbs from his mother-in-law, Stacy Clyburn (Michelle Pfeiffer). Bryan Alexander, USA Today, 24 Mar. 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

Cite this Entry

“Mother-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mother-in-law. Accessed 1 Apr. 2026.

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

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