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A monophthong is a vowel whose quality remains constant throughout its pronunciation.
- [i] in reed, fee, or east
- (NB: monophthongs are becoming increasingly rare in many dialects of American English, so some speakers may not produce this vowel as a monophthong.)
From Greek mono-phthongos 'single-sound'.
- diphthong (a vowel whose quality changes once during its pronunciation)
- triphthong (a vowel whose quality changes twice during its pronunciation)