Universal 816:
- Original
- Diphthongs exist only in languages which have or had long vowels.
- Standardized
- IF there are diphthongs, THEN there are or were long vowels.
- Keywords
- vowel, long, diphthong
- Domain
- phonology
- Type
- implication
- Status
- achronic, diachronic
- Quality
- absolute
- Basis
- Finno-Ugric languages
- Source
- DĂ©csy 1970: 15, DĂ©csy 1987: 56
- Counterexamples
