D0238400 (dĭf′thông-īz′, -thŏng-, dĭp′-)tr. & intr.v.diph·thong·ized, diph·thong·iz·ing, diph·thong·iz·es To pronounce as or become a diphthong.diph′thong·i·za′tion(-ĭ-zā′shən) n.TranslationsDiphthongierungдифтонгизацияEncyclopediaSeeDiphthongThesaurusSeediphthongize