monophthongal
adjective/ˌmɒnəfˈθɒŋɡl/, /ˌmɒnəˈθɒŋɡl/
/ˌmɑːnəfˈθɔːŋɡl/, /ˌmɑːnəˈθɔːŋɡl/
(phonetics)- consisting of only one vowel sound, for example the /uː/ sound in queue /kjuː/ compare diphthongal, triphthongal
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monophthongal