to change into a diphthong, as by affixing another vowel to a simple vowel

English - English

Definition of to change into a diphthong, as by affixing another vowel to a simple vowel in English English dictionary

diphthongize

Hyphenation

to change in·to a diphthong, as by affixing an·oth·er vow·el to a sim·ple vow·el