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Crossword clue: change from a simple vowel to a diphthong

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

diphthongize 12 letters wn-def

change from a simple vowel to a diphthong

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Related clues

To change into a diphthong, as by affixing another vowel to a simple vowel. "The diphthongized long vowels." H. Sweet.