monophthongal

/ˌmɑnəfˈθɔŋɡəl/
adjective
  1. Relating to or consisting of a single vowel sound that does not change quality.
    • The teacher explained the difference between monophthongal and diphthongal vowels.
    • The monophthongal vowel in 'hat' is short and steady.
    • Some dialects have more monophthongal sounds than others.
Antonyms
What does "monophthongal" mean? | whatsthatwordmean | whatsthatwordmean