Monophthongization

The Century Dictionary and Cyclopedia
  • noun. The reduction of a diphthong to a single sound.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. The process of becoming monophthong, for a diphthong or triphthong.
  • Word Usage
    "The second monophthongization is pretty much unique to Pittsburgh, at least among American English speakers."