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Very rarely, the nucleus of a single syllable may contain three vowel sounds that quickly glide together; these compound sounds are known as triphthongs.
There are three triphthongs that are generally agreed upon in American English: /aʊə/ (“ah-oo-uh”), /aɪə/ (“ah-ih-uh”), and /jʊə/ (“ee-oo-uh”). These always come before an R sound in a word.
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 (trĭf′thông′, -thŏng′, trĭp′-)
A compound vowel sound resulting from the succession of three simple ones and functioning as a unit.

triph·thon′gal (-thông′əl, -thŏng′əl) adj.


(ˈtrɪfθɒŋ; ˈtrɪp-)
1. (Phonetics & Phonology) a composite vowel sound during the articulation of which the vocal organs move from one position through a second, ending in a third
2. (Phonetics & Phonology) a trigraph representing a composite vowel sound such as this
[C16: via New Latin from Medieval Greek triphthongos, from tri- + phthongos sound; compare diphthong]
triphˈthongal adj


(ˈtrɪf θɔŋ, -θɒŋ, ˈtrɪp-)

1. a monosyllabic speech-sound sequence made up of three differing vowel qualities, as in some pronunciations of our.
[1590–1600; < New Latin triphthongus < Medieval Greek tríphthongos with three vowels =tri- tri- + phthóngos voice, sound]
triph•thong′al (-gəl) adj.


[ˈtrɪfθɒŋ] Ntriptongo m
References in periodicals archive ?
On the other hand, tripthongs are constituted by a central vowel, which makes up the nucleus and it is the one pronounced more energetically, flanked by two semi-consonants or semivowels: [uai] a.