Diphthong: Wikis

  
  

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In phonetics, a diphthong, pronounced /ˈdɪf.θɒŋ/ or /ˈdɪp.θɒŋ/, (also gliding vowel) (from Greek δίφθογγος, diphthongos, literally "two sounds" or "two tones") is a contour vowel—that is, a unitary vowel that changes quality during its pronunciation, or "glides", with a smooth movement of the tongue from one articulation to another, as in the English words eye, boy, and cow. This contrasts with "pure" vowels, or monophthongs, where the tongue is held still, as in the English word papa.[1]

Diphthongs often form when separate vowels are run together in rapid speech during a conversation. However, there are also unitary diphthongs, as in the English examples above, which are heard by listeners as single-vowel sounds (phonemes).[2]

In the International Phonetic Alphabet, pure vowels are transcribed with one letter, as in English sun [sʌn]. Diphthongs are transcribed with two letters, as in English sign [saɪ̯n] or sane [seɪ̯n]. The two vowel symbols are chosen to represent the beginning and ending positions of the tongue, though this can be only approximate. The diacritic <  ̯> is placed under the less prominent component to show that it is part of a diphthong rather than a separate vowel, though it is sometimes omitted in languages such as English, where there is not likely to be any confusion. (In precise transcription, [ai] represents two vowels in hiatus, found for example in Hawaiian and in the English word naïve, and does not represent the diphthong, for instance, in the Finnish word laiva, "ship").

Contents

Types of diphthongs

Falling (or descending) diphthongs start with a vowel quality of higher prominence (higher pitch or volume) and end in a semivowel with less prominence, like [aɪ̯] in eye, while rising (or ascending) diphthongs begin with a less prominent semivowel and end with a more prominent full vowel, similar to the [ja] in yard. The less prominent component in the diphthong may also be transcribed as an approximant, thus [aj] in eye and [ja] in yard. However, when the diphthong is analysed as a single phoneme, both elements are often transcribed with vowel letters (/aɪ̯/, /ɪ̯a/). Note also that semivowels and approximants are not equivalent in all treatments, and in the English and Italian languages, among others, many phoneticians do not consider rising combinations to be diphthongs, but rather sequences of approximant and vowel. There are many languages (such as Romanian) that contrast one or more rising diphthongs with similar sequences of a glide and a vowel in their phonetic inventory.[3]

In closing diphthongs, the second element is more close than the first (e.g. [ai]); in opening diphthongs, the second element is more open (e.g. [ia]). Closing diphthongs tend to be falling ([ai̯]), and opening diphthongs are generally rising ([i̯a]), as open vowels are more sonorous and therefore tend to be more prominent. However, exceptions to this rule are not rare in the world's languages. In Finnish, for instance, the opening diphthongs /ie̯/ and /uo̯/ are true falling diphthongs, since they begin louder and with higher pitch and fall in prominence during the diphthong.

A centering diphthong is one that begins with a more peripheral vowel and ends with a more central one, such as [ɪə̯], [ɛə̯], and [ʊə̯] in Received Pronunciation or [iə̯] and [uə̯] in Irish. Many centering diphthongs are also opening diphthongs ([iə̯], [uə̯]).

Some languages contrast short and long diphthongs, the latter usually being described as having a long first element (see vowel length). Languages that contrast three quantities in diphthongs are extremely rare, but not unheard of; Northern Sami is known to contrast long, short and finally stressed diphthongs, the last of which are distinguished by a long second element.

While there are a number of similarities, diphthongs are not the same as a combination of a vowel and an approximant or glide. Most importantly, diphthongs are fully contained in the syllable nucleus[4][5] while a semivowel or glide is restricted to the syllable boundaries (either the onset or the coda). This often manifests itself phonetically by a greater degree of constriction.[6] though this phonetic distinction is not always clear.[7] The English word yes, for example, consists of a palatal glide followed by a monophthong rather than a rising diphthong. In addition, while the segmental elements must be different in diphthongs so that [ii̯], when it occurs in a language, does not contrast with [iː] though it is possible to contrast [ij] and [iː].[8]

Diphthongs in various languages

Catalan

Catalan possesses a number of phonetic diphthongs, all of which begin or end in [j] or [w]. They include:[9]

[ej] rei 'king' [ɛw] peu 'foot'
[uj] avui 'today' [ow] pou 'well'
[ja] iaia 'grandma' [wa] quatre 'four'
[jɛ] veiem 'we see' [wə] aigua 'water'

In addition to these, Catalan also possesses two sets of diphthongs in variation; [wi] varies with [uj] (as in afluixar [aflujˈɕa~aflwiˈɕa] 'to loosen') and [iw] with [ju].[9]

There are also certain instances of compensatory diphthongization in the Majorcan dialect so that /ˈtroncs/ ('logs') (in addition to deleting the palatal plosive) develops a compensating palatal glide and surfaces as [ˈtrojns] (and contrasts with the unpluralized [ˈtronʲc]). Diphthongization compensates for the loss of the palatal stop (part of Catalan's segment loss compensation). There are other cases where diphthongization compensates for the loss of point of articulation features (property loss compensation) as in [ˈaɲ] ('year') vs [ˈajns] ('years').[10]

The dialectal distribution of compensatory diphthongization is almost entirely dependent on the dorsal plosive (whether it is velar or palatal) and the extent of consonant assimilation (whether or not it's extended to palatals).[11]

Croatian

  • i(j)e, as in mlijeko[12]

Croatian dialects also have uo, as in kuonj, ruod, uon[13] while, in Standard Croatian, these words are konj, rod, on)

Czech

There are three diphthongs in Czech:

  • /aʊ̯/ as in auto (almost exclusively in words of foreign origin)
  • /eʊ̯/ as in euro (in words of foreign origin only)
  • /oʊ̯/ as in koule

The vowel groups ia, ie, ii, io, and iu in foreign words are not regarded as diphthongs, they are pronounced with /j/ between the vowels [ɪja, ɪjɛ, ɪjɪ, ɪjo, ɪju].

Dutch

Diphthongs of Dutch
Netherlandic[14] Belgian[15]
zeis [ɛɪ̯]
ui [œʏ̯]
zout [ʌʊ̯] [ɔʊ̯]
beet1 [eɪ̯] [eː]
neus1 [øʏ̯] [øː]
boot1 [oʊ̯] [oː]
  1. [eɪ̯], [øʏ̯], and [oʊ̯] are normally pronounced as closing diphthongs except before [ɾ] in the same word, in which case they are centering diphthongs: [eə̯], [øə̯], and [oə̯]. In many dialects, they are monophthongized[16]

The dialect of Hamont (in Limburg) has five centring diphthongs and contrasts long and short forms of [ɛɪ̯], [œʏ̯], [ɔʊ̯], and [ɑʊ̯].[17]

English

All English diphthongs are falling, apart from /juː/, which can be analyzed as [i̯uː].

Standard English diphthongs
RP (British) Australian American
GA Canadian
low [əʊ̯] [əʉ̯] [oʊ̯]
loud [aʊ̯] [æɔ̯] [aʊ̯] [aʊ̯]
lout [əʊ̯]1
lied [aɪ̯] [ɑe̯] [aɪ̯]
light [əɪ̯]1
lane [eɪ̯] [æɪ̯] [eɪ̯]
loin [ɔɪ̯] [oɪ̯] [ɔɪ̯]
loon [uː] [ʉː] [ʊu̯]4
lean [iː] [ɪi̯]4 [ɪi̯]4
leer [ɪə̯] [ɪə̯] [ɪɚ̯]3
lair [ɛə̯]2 [eː]2 [ɛɚ]3
lure [ʊə̯]2 [ʊə̯] [ʊɚ̯]3
  1. Canadian English exhibits allophony of /aʊ̯/ and /aɪ̯/ called Canadian raising. GA and RP have raising to a lesser extent in /aɪ̯/.
  2. In Received Pronunciation, the vowels in lair and lure may be monophthongized to [ɛː] and [oː] respectively.[18] Australian English speakers more readily monophthongize the former.
  3. In rhotic dialects, words like pair, poor, and peer can be analyzed as diphthongs, although other descriptions analyze them as vowels with [ɹ] in the coda.
  4. The erstwhile monophthongs /iː/ and /uː/ are diphthongized in many dialects. In many cases they might be better transcribed as [uu̯] and [ii̯], where the non-syllabic element is understood to be closer than the syllabic element. They are sometimes transcribed /uw/ and /ij/.

Faroese

Diphthongs in Faroese are:

  • /ai/ as in bein (can also be short)
  • /au/ as in havn
  • /ɛa/ as in har, mær
  • /ɛi/ as in hey
  • /ɛu/ as in nevnd
  • /œu/ as in nøvn
  • /ʉu/ as in hús
  • /ʊi/ as in mín, , (can also be short)
  • /ɔa/ as in ráð
  • /ɔi/ as in hoyra (can also be short)
  • /ɔu/ as in sól, ovn

Finnish

All Finnish diphthongs are falling. Notably, Finnish has true opening diphthongs (e.g. /uo/), which are not very common crosslinguistically compared to centering diphthongs (e.g. /uə/ in English).

closing
  • [ai̯] as in laiva (ship)
  • [ei̯] as in keinu (swing)
  • [oi̯] as in poika (boy)
  • [æi̯] as in äiti (mother)
  • [øi̯] as in öisin (at nights)
  • [au̯] as in lauha (mild)
  • [eu̯] as in leuto (mild)
  • [ou̯] as in koulu (school)
  • [ey̯] as in leyhyä (to waft)
  • [æy̯] as in täysi (full)
  • [øy̯] as in löytää (to find)
close
  • [ui̯] as in uida (to swim)
  • [yi̯] as in lyijy (lead)
  • [iu̯] as in viulu (violin)
  • [iy̯] as in siistiytyä (to smarten up)
opening
  • [ie̯] as in kieli (tongue)
  • [uo̯] as in suo (bog)
  • [yø̯] as in (night)

German

Diphthongs in German:

  • [aɪ̯] as in Reich 'empire'
  • [aʊ̯] as in Maus 'mouse'
  • [ɔʏ̯] as in neu 'new'
  • [eːɐ̯] as in sehr 'very'
  • [iːɐ̯] as in dir 'you (dative)'
  • [oːɐ̯] as in Bor 'boron (element)'
  • [øːɐ̯] as in Öhr 'eye (hole in a needle)'
  • [uːɐ̯] as in nur 'only'
  • [yːɐ̯] as in Tür 'door'

Some diphthongs in Bernese, a Swiss German dialect:

  • [iə̯] as in Bier 'beer'
  • [yə̯] as in Fuß 'feet'
  • [uə̯] as in Schue 'shoes'
  • [ou̯] as in Stou 'holdup'
  • [au̯] as in Stau 'stable'
  • [aːu̯] as in Staau 'steel'
  • [æu̯] as in Wäut 'world'
  • [æːu̯] as in wääut 'elects'
  • [ʊu̯] as in tschúud 'guilty'

Icelandic

Diphthongs in Icelandic are the following:

  • /aw/ as in átta, "eight"
  • /ow/ as in nóg, "enough"
  • /œɥ/ as in auga, "eye"
  • /aj/ as in , "hi"
  • /ej/ as in þeir, "they"

Combinations of j and a vowel are the following:

  • /ja/ as in jata, "manger"
  • /jaw/ as in , "yes"
  • /jo/ as in joð, "iodine," "jay," "yod" (only in a handful of words of foreign origin)
  • /jow/ as in jól, "Christmas"
  • /jœ/ as in jötunn, "giant"
  • /jaj/ as in jæja, "oh well"

Irish

All Irish diphthongs are falling.

  • [əi̯], spelled aigh, aidh, agh, adh, eagh, eadh, eigh, or eidh
  • [əu̯], spelled abh, amh, eabh, or eamh
  • [iə̯], spelled ia, iai
  • [uə̯], spelled ua, uai

Italian

In standard Italian, only falling diphthongs are considered to be true diphthongs. Rising diphthongs are considered to be sequences of approximant and vowel.[citation needed] The diphthongs of Italian are:[19]

falling
  • [ei̯] as in potei ('could 1.sg.')
  • [ɛi̯] as in sei ('six')
  • [ai̯] as in baita ('mountain hut')
  • [ɔi̯] as in poi ('later')
  • [oi̯] as in voi ('you pl.')
  • [ui̯] as in lui ('he')
  • [eu̯] as in pleurite ('pleuritis')
  • [ɛu̯] as in neutro ('neuter')
  • [au̯] as in auto ('car')
rising
  • [je] as in soffietto ('bellows')
  • [jɛ] as in pieno ('full')
  • [ja] as in chiave ('key')
  • [jɔ] as in chiodo ('nail')
  • [jo] as in fiore ('flower')
  • [ju] as in piuma ('feather')
  • [wi] as in guida ('guide')
  • [we] as in quello ('this')
  • [wɛ] as in quercia ('oak')
  • [wa] as in guado ('ford')
  • [wɔ] as in quota ('quota')
  • [wo] as in acquoso ('watery')

In general, unstressed /i e o u/ in hiatus can turn into glides in more rapid speech (e.g. biennale [bjenˈnaːle] 'biennial'; coalizione [ko̯aliˈtːsjoːne] 'coalition') with the process occurring more readily in syllables further from stress.[20]

Maltese

Maltese has seven falling diphthongs.[21]

  • [ɛɪ̯] ej or għi
  • [ɐɪ̯] aj or għi
  • [ɔɪ̯] oj
  • [ɪʊ̯] iw
  • [ɛʊ̯] ew
  • [ɐʊ̯] aw or għu
  • [ɔʊ̯] ow or għu

Mandarin Chinese

Rising diphthongs in Mandarin are usually regarded as a combination of a medial glide (i, u, or ü) and a final segment, while falling diphthongs are seen as one final segment. Tone marker is always placed on the vowel with more prominence.

rising
  • ia/ya:
    • [i̯a], as in jiā (家, home), (鴨, duck)
    • [i̯ɛ], as in jiǎn (剪, to cut), yǎn (眼, eye)
    • [i̯ɑ], as in xiǎng (想, to think), yǎng (癢, itchy)
  • ie/ye: [i̯ɛ], as in xiè (謝, to thank), (葉, leaf)
  • yo: [i̯ɔ], as in (唷, an interjection) 1
  • iong/yong: [i̯ʊŋ], as in xiōng (兇, menacing), yǒng (永, forever)
  • ua/wa:
    • [u̯a], as in guā (瓜, melon), (挖, to dig), guǎn (管, tube), uǎn (碗, bowl)
    • [u̯ɑ], as in zhuāng (裝, to fill), wàng (忘, to forget)
  • wen: [u̯ən], as in wèn (問, to ask) 12
  • weng: [u̯ɤŋ], as in wēng (翁, old man) 12
  • uo/wo: [u̯ɔ], as in huǒ (火, fire), (我, I)
  • üan/yuan: [y̯ɛn], as in xüǎn (選, to choose), yuǎn (遠, far) 2
  • üe/yue: [y̯ɛ], as in xüé (學, to learn), yuè (越, to cross)
falling
  • ai: [ai̯], as in ài (愛, love)
  • ei: [ei̯], as in lèi (累, tired)
  • ao: [ɑʊ̯], as in dào (道, way)
  • ou: [oʊ̯], as in dòu (豆, bean)

1 only occurs in isolation

2 always followed by nasal

Northern Sami

The diphthong system in Northern Sami varies considerably from one dialect to another. The Western Finnmark dialects distinguish four different qualities of opening diphthongs:

  • /eæ/ as in leat "to be"
  • /ie/ as in giella "language"
  • /oa/ as in boahtit "to come"
  • /uo/ as in vuodjat "to swim"

In terms of quantity, Northern Sami shows a three-way contrast between long, short and finally stressed diphthongs. The last are distinguished from long and short diphthongs by a markedly long and stressed second component. Diphthong quantity is not indicated in spelling.

Norwegian

There are five diphthongs in Norwegian:

  • [æɪ̯] as in nei, "no"
  • [øʏ̯] as in øy, "island"
  • [æʉ̯] as in sau, "sheep"
  • [ɑɪ̯] as in hai, "shark"
  • [ɔʏ̯] as in joik, "Sami song"

An additional diphthong, [ʉ̫ʏ̯], occurs only in the word hui in the expression i hui og hast "in great haste".

Portuguese

European Portuguese has 14 phonemic diphthongs (10 oral and 4 nasal),[22] all of which are falling diphthongs formed by a vowel and a nonsyllabic high vowel. Brazilian Portuguese has roughly the same amount, although the two dialects have slightly different pronunciations. A [w] onglide after /k/ or /ɡ/ as in quando [kʊ̯ɐ̃dʊ] ('when') or [ˈɡʊ̯aɾdɐ] ('guard') may also form rising diphthongs and triphthongs. Additionally, in casual speech, adjacent heterosyllabic vowels may combine into diphthongs and triphthongs or even sequences of them;[23] in more formal speech, these are realized as hiatus e.g., férias [ˈfɛ.ɾi.ɐʃ] ~ [ˈfɛ.ɾjɐʃ].[citation needed]

Diphthongs of Portuguese
EP[22] BP
anéis [ɛɪ̯]
sai [aɪ̯]
sei [ɐɪ̯] [eɪ̯]
mói [ɔɪ̯]
moita [oɪ̯]
anuis [uɪ̯]
viu [iu̯]
meu [eu̯]
véu [ɛu̯]
mau [au̯]
cem [ɐ̃ɪ̯] [ẽɪ̯]
mãe [ɐ̃ɪ̯]
anões [õɪ̯]
muita [ũɪ̯]
mão [ɐ̃u̯]

In addition, phonetic diphthongs are formed in Brazilian Portuguese by the vocalization of /l/ in the syllable coda with words like sol [sɔʊ̯] ('sun') and sul [suʊ̯] ('south') as well as by yodization of vowels preceding /s/ in words like arroz [aʁoɪ̯s] ('rice') and mas [maɪ̯s] ('but').[23]

Romanian

Romanian has two diphthongs: /e̯a/ and /o̯a/. As a result of their origin (diphthongization of mid vowels under stress), they appear only in stressed syllables[24] and make morphological alternations with the mid vowels /e/ and /o/. To native speakers, they sound very similar to /ja/ and /wa/ respectively.[25] There are no perfect minimal pairs to contrast /o̯a/ and /wa/,[26] and because /o̯a/ doesn't appear in the final syllable of a prosodic word, there are no monosyllabic words with /o̯a/; exceptions might include voal ('veil') and trotuar ('sidewalk'), though Ioana Chiţoran argues[27] that these are best treated as containing glide-vowel sequences rather than diphthongs. In addition to these, the semivowels /j/ and /w/ can be combined (either before, after, or both) with most vowels, while this arguably[28] forms additional diphthongs and triphthongs, only /e̯a/ and /o̯a/ can follow an obstruent-liquid cluster such as in broască ('frog') and dreagă ('to mend').[29] implying that /j/ and /w/ are restricted to the syllable boundary and therefore, strictly speaking, do not form diphthongs.

Spanish

Spanish has six falling diphthongs and eight rising diphthongs. In addition, during fast speech, sequences of vowels in hiatus become diphthongs wherein one becomes non-syllabic (unless they are the same vowel, in which case they fuse together) as in poeta [ˈpo̯eta] ('poet') and maestro [ˈmae̯stɾo] ('teacher'). The phonemic diphthongs are:[30]

falling
  • /ei̯/ as in rey ('king')
  • /ai̯/ as in aire ('air')
  • /oi̯/ as in hoy ('today')
  • /eu̯/ as in neutro ('neutral')
  • /au̯/ as in pausa ('pause')
  • /ou̯/ as in bou ('seine fishing')
rising
  • /je/ as in tierra ('earth')
  • /ja/ as in hacia ('towards')
  • /jo/ as in radio ('radio')
  • /ju/ as in viuda ('widow')
  • /wi/ as in fuimos ('we went')
  • /we/ as in fuego ('fire')
  • /wa/ as in cuadro ('picture')
  • /wo/ as in cuota ('quota')

Thai

In addition to vowel nuclei following /j/ and /w/, Thai has three diphthongs:[31]

  • [ia̯]
  • [ɯa̯]
  • [ua̯]

Yiddish

Yiddish has three diphthongs:[32]

  • [ɛɪ̯] as in [plɛɪ̯tə] פּליטה ('refugee' f.)
  • [aɛ̯] as in [naɛ̯n] נײַן ('nine')
  • [ɔə̯] as in [ɔəf̯n̩] אופֿן ('way')

Diphthongs may reach a higher target position (towards /i/) in situations of coarticulatory phenomena or when words with such vowels are being emphasized.

Zulu

Diphthongs between true vowels never occur in Zulu, with each syllable having only one vowel sound, e.g. [iːǃaːǃa]. However, Zulu has two semi-vowels which form diphthongs with vowels:

  • [ja] as in [ŋijaɠuˈɓɛːɠa] ngiyakubeka (I am placing it)
  • [wa] as in [ŋiːwa] ngiwa (I fall/I am falling)

See also

References

  1. ^ The tongue will move at the boundaries even of monophthongs, because this is necessary for the pronunciation of adjacent consonants. However, the description given here is correct for the middle of the vowel, which is most prominent to the human ear. Monophthongs can be pronounced in isolation without any movement of the tongue, which is not possible for diphthongs. More technically, monophthongs are said to have one target tongue position, diphthongs two, and triphthongs three.
  2. ^ SIL International definition of 'Diphthong' accessed 17 January 2008
  3. ^ Chițoran (2002a:203)
  4. ^ Kaye & Lowenstamm (1984:139)
  5. ^ Schane (1995:588)
  6. ^ Padgett (2007:1938)
  7. ^ Schane (1995:606)
  8. ^ Schane (1995:589, 606)
  9. ^ a b Carbonell & Llisterri (1992:54)
  10. ^ Mascaró (2002:580-581)
  11. ^ Mascaró (2002:581)
  12. ^ (Croatian) Vjesnik Babić ne zagovara korijenski pravopis, nego traži da Hrvati ne piju mlijeko nego - mlieko
  13. ^ (Croatian) Kolo Josip Lisac: Štokavsko narječje: prostiranje i osnovne značajke
  14. ^ Gussenhoven (1992:46)
  15. ^ Verhoeven (2005:245)
  16. ^ See Verhoeven & Van Bael (2002) for more information.
  17. ^ Verhoeven (2007:221)
  18. ^ Roach (2004:240)
  19. ^ Bertinetto & Loporcaro (2005:138)
  20. ^ Bertinetto & Loporcaro (2005:139)
  21. ^ Borg & Azzopardi-Alexander (1997:299)
  22. ^ a b Cruz-Ferreira (1995:92)
  23. ^ a b Barbosa & Albano (2004:230)
  24. ^ Chițoran (2002a:204)
  25. ^ Chițoran (2002a:206)
  26. ^ Chițoran (2002a:203)
  27. ^ Chițoran (2002b:217)
  28. ^ See Chițoran (2001:8-9) for a brief overview of the views regarding Romanian semivowels
  29. ^ Chițoran (2002b:213)
  30. ^ Martínez-Celdrán, Fernández-Planas & Carrera-Sabaté (2003:256)
  31. ^ Tingsabadh & Abramson (1993:25)
  32. ^ Kleine (2003:263)

Bibliography

  • Barbosa, Plínio A.; Albano, Eleonora C. (2004), "Brazilian Portuguese", Journal of the International Phonetic Association 34 (2): 227–232, doi:10.1017/S0025100304001756 
  • Bertinetto, Pier Marco; Loporcaro, Michele (2005), "The sound pattern of Standard Italian, as compared with the varieties spoken in Florence, Milan and Rome", Journal of the International Phonetic Association 35 (2): 131–151 
  • Borg, Albert J.; Azzopardi-Alexander, Marie (1997). Maltese. Routledge. ISBN 0415022436. 
  • Carbonell, Joan F.; Llisterri, Joaquim (1992), "Catalan", Journal of the International Phonetic Association 22 (1-2): 53–56, doi:10.1017/S0025100300004618 
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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also diphthong

German

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Diphthong

Wikipedia de

Noun

Diphthong m.

  1. (phonetics) diphthong

Simple English

A Diphthong (pronounced "DIF-thong") is a vowel that a person has to move his or her mouth into two different positions to make. It is a vowel where two different vowel qualities can be heard.[1] Examples are: waist, die, noise, road, house, fierce, bear, sure. Each of these is a different vowel sound.

A monophthong is a simple vowel sound that a person does not have to move his mouth to make, like the "oo" sound in "book." In a diphthong, the person combines two different monophthongs, as with the "oi" sound in the word "oil." The person starts with the mouth in the position to make an "o" sound, then quickly moves the mouth to make a hard "e" sound. Another example is the "ou" sound in the word "house." The mouth starts out making a sound like the soft "a" sound in "flat," then moves to make the a hard "oo" sound like the one in "caboose."

Just like with every other part of language, the exact way to pronounce a diphthong is a little different for different accents.

The word diphthong is derived from the old Greek language. Here, di means two or double, while the part -phthong means sound or tone, from the basic word phthalein, which means speak, creating sound by the voice.

A diphthong can be a lexeme of a language and as such it may be one syllable, but rarely.

See also:

References

  1. Crystal, David 1995. The Cambridge encyclopedia of the English language. Cambridge. p237








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