Diphthongised is a noun referring to the process of forming or becoming a diphthong, or to something that has been converted into, or characterized by, diphthongs. It denotes a linguistic change or a feature in which a vowel quality shifts within a syllable, moving from one vowel sound to another within the same nucleus. In practice, it describes how a word’s vowel is realized as a glide-leading vowel sequence in speech.
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