Kalmar "diphthongise" ba ta bayyana a matsayin sanannun kalma a daidaitattun ƙamus na Turanci. Sai dai kalmar “diphthongize” kalma ce ta Ingilishi ingantacciya, kuma tana nufin furtawa ko rubuta a matsayin diphthong, wato sauti ne da aka yi da wasula guda biyu da ake furtawa a cikin sila ɗaya, kamar “oi” a “murya” ko kuma. "kai" a cikin "gidan".
