Definition of monophthongize in English:

monophthongize

(also monophthongise)

verb

  • 1with object To change or convert (a vowel sound) into a monophthong.

  • 2no object To change or convert a vowel sound to a monophthong.

Origin

Early 20th century; earliest use found in Modern Language Notes. From monophthong + -ize, after diphthongize.

Pronunciation

monophthongize

/ˈmɒnə(f)θɒŋʌɪz/