Entry 1 sense Webster, 1913 Daughter-in-law /dôt'-ẽr-ĭn-lôˌ/ · Daugh·ter-in-law · IPA /ˈdɔːtə(ɹ)ɪnˌlɔː/ 01 n. The wife of one's son. pl. Daughters-in-law 1. The wife of one's son.