| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Adjective | 1. Of the nature of diphthong; diphthongal.[Websters]. | |
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Date "Diphthongic" was first used in popular English literature: sometime before 1914. (references) |
| Part of Speech | Definition | |
| Adjective | 1. Of the nature of diphthong; diphthongal.[Websters]. | |
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Date "DIPHTHONGIC" was first used in popular English literature: sometime before 1914. (references) |