diphthongal
adjective/dɪfˈθɒŋɡl/, /dɪpˈθɒŋɡl/
/dɪfˈθɔːŋɡl/, /dɪpˈθɔːŋɡl/
(phonetics)- combining two vowel sounds or vowel letters, for example the sounds /aɪ/ in pipe /paɪp/ or the letters ou in doubt compare monophthongal, triphthongal
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diphthongal