Definition of monophthong noun from the Oxford Advanced American Dictionary

 

monophthong

 noun
noun
NAmE//ˈmɑnəfˌθɔŋ//
 
, NAmE//ˈmɑnəfˌθɑŋ//
 
(phonetics)
 
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a speech sound that consists of only one vowel sound, for example the sound/u/ in tune/tun/ compare diphthong, triphthong
monophthongal
 
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NAmE//ˌmɑnəfˈθɔŋɡl//
 
, NAmE//ˌmɑnəfˈθɑŋɡl//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: monophthong