Found 2 items, similar to diphthongize.
English → English (WordNet) Definition: diphthongize diphthongize v : change from a simple vowel to a diphthong; “This vowel diphthongized in Germanic” [syn: diphthongise]
English → English (gcide) Definition: Diphthongize Diphthongize \Diph"thong*ize\, v. t. & i. To change into a diphthong, as by affixing another vowel to a simple vowel. “The diphthongized long vowels.” --H. Sweet. [1913 Webster]