Other Word Forms of Diphthong
Origin of Diphthong
Middle English diptonge from Old French diptongue from Late Latin diphthongus from Greek diphthongos di- two di–1 phthongos sound
From American Heritage Dictionary of the English Language, 5th Edition
French diphtongue, from Ancient Greek δίφθογγος (diphthongos, “two sounds”), from δίς (dis, “twice”) + φθόγγος (phthongos, “sound”).
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