diphthong

The story

1. Ancient Greek · derived fromδίφθογγος“two sounds”
2. Late Latin · derived fromdiphthongus
3. French · derived fromdiphtongue
4. English todaydiphthong

PIE word *dwóh₁ Etymology tree Proto-Indo-European *dwóh₁ Proto-Indo-European *dwi- Proto-Hellenic *dwi- Ancient Greek δι- (di-) Ancient Greek φθέγγομαι (phthéngomai) Ancient Greek φθόγγος (phthóngos) Ancient Greek δίφθογγος (díphthongos)der. Latin diphthonguslbor. French diphtongueder. English diphthong From French diphtongue, from Late Latin diphthongus, from Ancient Greek δίφθογγος (díphthongos, “two sounds”), from δίς (dís, “twice”) + φθόγγος (phthóngos, “sound”). Displaced native Old English twifeald swēġ, (literally, "twofold swey").