| Nonetheless, a number of studies suggest that at least diphthongization and nasal and lateral depalatalization may be unproductive in Spanish. |
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| In historical linguistics, vowel breaking, vowel fracture, or diphthongization is the change of a monophthong into a diphthong or triphthong. |
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| Vowel breaking or diphthongization is a vowel shift in which a monophthong becomes a diphthong. |
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| Only Lorrainian and Low Hessian, of all the Rhine Franconian area, remained unaffected by diphthongization. |
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| Also, diphthongization in modern dialects has been leveled due to the widespread use of standard language. |
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| Note in parentheses that diphthongization may be viewed in a similar light. |
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| The long u is absent because diphthongization into ui is a common feature of the North Estonian dialects. |
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