a speech sound that consists of only one vowel sound, for example the sound/u/ in tune/tun/ compare diphthong, triphthong
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NAmE//ˌmɑnəfˈθɔŋɡl//, NAmE//ˌmɑnəfˈθɑŋɡl//
adjectiveSee monophthong in the Oxford Advanced Learner's DictionaryCheck pronunciation: monophthong