What does "monophthongal" mean?

Of or pertaining to a monophthong.

What is a synonym for "monophthongal"?

Common synonyms include: alveolar, assimilated, back, bilabial, broad, central.

Pronounced //ˌmɑ.nəfˈθɑŋ.əl//.

/ˌmɑ.nəfˈθɑŋ.əl/ adj

adj ·Uncommon ·Advanced level

Adjective

1
Of or pertaining to a monophthong. not-comparable
2
Pronounced as a single vowel sound; said especially of a vowel that is also commonly pronounced as a diphthong. not-comparable

From monophthong + -al.