dʰugh₂tḗr

The reconstruction *dʰugh₂tḗr presents a notable case in comparative linguistics: while most branches preserve cognate forms, Latin replaced the inherited term entirely. Latin fīlia ("daughter"), from the root *dʰeh₁(i)- ("to suckle"), displaced the expected reflex of *dʰugh₂tḗr—one of the few cases where a core kinship term was replaced in a major branch. Greek thygátēr (θυγάτηρ) preserves the form most transparently, with the expected aspiration of initial *dʰ- to th-. The word remained the standard term for daughter throughout the history of Greek. Sanskrit duhitā́ shows regular Indo-Iranian development, with *dʰ- > dh- > d- in certain phonological environments. The Avestan dugədar- confirms the reconstruction. Germanic *duhtēr yields Old English dohtor (Modern English daughter), Old High German tohter (Modern German Tochter), Old Norse dóttir, and Gothic dauhtar. The initial d- in Modern English (rather than the expected th- from Grimm's Law *dʰ > *ð > d) reflects the regular Germanic treatment of *dʰ as *d. Lithuanian duktė̃ and Old Church Slavonic dŭšti continue the Balto-Slavic reflexes. Armenian dustr shows the expected development in that branch. The etymology of *dʰugh₂tḗr itself remains debated. One widely discussed proposal connects it to *dʰewgʰ- ("to milk"), interpreting the daughter as "the one who milks"—reflecting a pastoral society in which milking was a task assigned to young women. This interpretation, while speculative, aligns with other evidence for the pastoral economy of PIE speakers.