World English Dictionary
diphthongize or diphthongise (ˈdɪfθɒŋˌaɪz, -ˌɡaɪz, ˈdɪp-, ˈdɪfθɒŋˌaɪz, -ˌɡaɪz, ˈdɪp-)
(often passive) to make (a simple vowel) into a diphthong
diphthongise or diphthongise
diphthongi'zation or diphthongise
diphthongi'sation or diphthongise

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