daughter-in-law

American  

[daw-ter-in-law] / ˈdɔ tər ɪnˌlɔ /

noun

plural

daughters-in-law

1. the wife of one's child.

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daughter-in-law British  

noun

1. the wife of one's son

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Etymology

Origin of daughter-in-law

First recorded in 1350–1400; Middle English doughter in lawe; see origin at daughter, in, law ¹; from Middle English in-lawe “in law,” i.e., “a person within the regulation and protection of the law,” based on the prohibition by Roman civil law and, later, Christian canon law, of marriages within four degrees of consanguinity, i.e., up to and including first cousins