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Definition of monophthong noun from the Oxford Advanced American Dictionary

monophthong

noun
/ˈmɑnəfˌθɔŋ; ˈmɑnəfˌθɑŋ/ monophthong pronunciation American
(phonetics)
 
a speech sound that consists of only one vowel sound, for example the sound /u/ in tune /tun/
compare diphthong, triphthong monophthongal
/ˌmɑnəfˈθɔŋɡl; ˌmɑnəfˈθɑŋɡl/ monophthongal pronunciation American
adjective