- Afrikaans:diftong,tweeklank
- Arabic:مُصَوِّت مُزْدَوِج m(muṣawwit muzdawij)
- Aragonese:diftongo m
- Armenian:երկբարբառ (hy)(erkbarbaṙ)
- Asturian:diptongu m
- Basque:diptongo
- Belarusian:дыфто́нг m(dyftónh),двухгало́сны m(dvuxhalósny)
- Bengali:জটিল স্বরধ্বনি(joṭil śśoroddhoni)
- Breton:diftongenn
- Bulgarian:дифто́нг m(diftóng)
- Catalan:diftong (ca) m
- Cebuano:diptonggo,duhanog,sikpat
- Chinese:
- Cantonese:雙元音 /双元音(soeng1 jyun4 jam1)
- Mandarin:雙元音 /双元音 (zh)(shuāngyuányīn)
- Czech:dvojhláska (cs) f
- Danish:diftong (da) c,tvelyd c
- Dutch:diftong (nl) m,tweeklank (nl) m
- Esperanto:diftongo
- Estonian:diftong,kaksiktäishäälik
- Faroese:tvíljóð n
- Finnish:diftongi (fi),kaksoisääntiö
- French:diphtongue (fr) f
- Friulian:diftonc m
- Galician:ditongo (gl) m
- Georgian:დიფთონგი(diptongi)
- German:Diphthong (de) m,Doppellaut (de) m,Zwielaut (de) m
- Greek:δίφθογγος (el) m(dífthongos)
- Ancient:δίφθογγος m(díphthongos)
- Gujarati:please add this translation if you can
- Hebrew:דִּיפְתּוֹנְג (he) m(diftóng)
- Hindi:संध्यक्षर(sandhyakṣar)
- Hungarian:kettőshangzó (hu),diftongus (hu)
- Icelandic:tvíhljóð n,tvíhljóði m
- Ido:diftongo (io)
- Indonesian:diftong (id),bunyi rangkap
- Interlingua:diphthongo
- Irish:défhoghar m
- Old Irish:déogur m
- Italian:dittongo (it) m
- Japanese:二重母音(にじゅうぼいん, nijū boin)
- Kazakh:дифтонг m(diftoñ)
- Khmer:please add this translation if you can
- Korean:이중모음(二重母音) (ko)(ijungmo'eum)
- Kyrgyz:дифтонг m(diftong)
- Lao:please add this translation if you can
- Latin:diphthongus (la),diphthongos f
- Latvian:divskanis m,diftongs m
- Limburgish:diftong,twieëklaank
- Lithuanian:dvibalsis
- Low German:
- Dutch Low Saxon:diftong,tweeklaank
- German Low German:Diphthong,Tweeklang
- Macedonian:дифтонг m(diftong)
- Malayalam:സംയുക്ത സ്വരം(saṁyukta svaraṁ)
- Maori:oro tōpū,ororua
- Navajo:zaaʼáán ałtah
- Northern Sami:diftoŋga
- Norwegian:
- Bokmål:diftong m,tvelyd
- Nynorsk:diftong m,tviljod
- Occitan:diftong (oc) m
- Odia:please add this translation if you can
- Old English:twifeald swēġ m
- Old Norse:tvíhljóðr m
- Persian:واکهٔ مرکب (fa)(vâke-ye morakkab)
- Polish:dyftong (pl) m,dwugłoska f
- Portuguese:ditongo (pt) m
- Punjabi:please add this translation if you can
- Romanian:diftong (ro) m
- Russian:дифто́нг (ru) m(diftóng),двугла́сный (ru) m(dvuglásnyj),двоегла́сный (ru) m(dvojeglásnyj)(dated)
- Scottish Gaelic:dà-fhoghar m,dà-ghuth m,dà-ghuthach m
- Serbo-Croatian:
- Cyrillic:дво̏гла̄с m
- Roman:dvȍglās (sh) m
- Sicilian:dittongu
- Slovak:dvojhláska f
- Slovene:diftóng,dvóglásnik
- Spanish:diptongo (es) m
- Swedish:diftong (sv) c
- Tagalog:kambal-patinig,diptonggo
- Tatar:дифтонг m(diftong)
- Thai:please add this translation if you can
- Tibetan:དབྱངས་སྒྲ་ཉིས་ལྡན(dbyangs sgra nyis ldan)
- Ukrainian:дифто́нг m(dyftónh),двоголосни́й m(dvoholosnýj)
- Urdu:please add this translation if you can
- Uzbek:diftong (uz)
- Veps:diftong
- Vietnamese:nguyên âm đôi,nhị trùng âm
- Walloon:diftongue
- Waray-Waray:latontiringgan
- Welsh:deusain f
- Yiddish:דיפֿטאָנג m(diftong),צווייקלאַנג(tsveyklang)
- Yoruba:fáwẹ̀lì ẹlẹ́yọ̀ọ́
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