Akademik

monophthongize
\\ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ˌ(g)īz\ transitive verb (-ed/-ing/-s)
: to change into a monophthong : reduce (a diphthong or triphthong) to a simple vowel sound

Useful english dictionary. 2012.