MONOPHTHONG Meaning of MONOPHTHONG in English monophthong BrE AmE ˈmɒn əf θɒŋ -əp-, -ə- AmE \ ˈmɑːn əf θɔːŋ -ə-, -θɑːŋ ▷ monophthong|ing ɪŋ▷ monophthong|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012