Universal #819
Legacy number: 819
| Number | 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 | Décsy 1970: 15, Décsy 1987: 56 |
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