# diphthongization

> English word · Noun

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

## Etymology
From diphthong + -ization.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/diphthongization