monophthongal UK /ˌmɒn.əfˈθɒŋ.ɡəl/US /ˌmɑ.nəfˈθɑŋ.əl/ adjective2 •Of or pertaining to a monophthong. •Pronounced as a single vowel sound; said especially of a vowel that is also commonly pronounced as a diphthong.
