Definition of monophthongal adjective from the Oxford Advanced Learner's Dictionary

 

monophthongal

 adjective
adjective
BrE BrE//ˌmɒnəfˈθɒŋl//
 
; NAmE NAmE//ˌmɑːnəfˈθɔːŋl//
 
, NAmE//ˌmɑːnəˈθɔːŋl//
 
(phonetics)
 
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consisting of only one vowel sound, for example the sound // in queue /kjuː/ compare diphthongal, triphthongal