Pertaining to a triphthong.

plural of triphthong

A monosyllabic vowel combination usually involving a quick but smooth movement from one vowel to another that passes over a third one.

Third-person singular simple present indicative form of triphthongize

simple past tense and past participle of triphthongize

(transitive, rare) To convert to a triphthong.

present participle of triphthongize