Definition of monophthong noun from the Oxford Advanced Learner's Dictionary

 

monophthong

 noun
noun
BrE BrE//ˈmɒnəfθɒŋ//
 
; NAmE NAmE//ˈmɑːnəfθɔːŋ//
 
, NAmE//ˈmɑːnəθɔːŋ//
 
(phonetics)
 
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a speech sound that consists of only one vowel sound, for example the sound // in queue /kjuː/ compare diphthong, triphthong Word Origin early 17th cent.: from Greek monophthongos, from monos ‘single’ + phthongos ‘sound’.
See the Oxford Advanced American Dictionary entry: monophthong