Of the nature of diphthong; diphthongal.

plural of diphthongation

diphthongisation

Either of the digraphs ει and ου in Ancient Greek, when they represent a long vowel arising from compensatory lengthening or contraction rather than an actual diphthong

plural of spurious diphthong

The process by which a single vowel sound (monophthong) shifts to a two-vowel vocalization (diphthong).

plural of diphthongisation

Third-person singular simple present indicative form of diphthongise

simple past tense and past participle of diphthongise

present participle of diphthongise