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A diphthong is a single-syllable vowel sound in which the beginning of the sound is different from the end sound—that is, the sound glides from one vowel sound to another. For this reason, diphthongs are often referred to as gliding vowels.
There are eight vowel sounds in American English that are generally agreed upon as being diphthongs.
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the combination of two vowels—a syllabic and a nonsyllabic vowel—in one syllable, for example, the French [oi]. Two types of diphthongs may be distinguished: the rising diphthong, in which the second vowel is the syllable-building element, for example, the French [ie] and [ui] and the falling diphthong, in which the first vowel is the syllable-building element, for example, the English [ai] and [au].

References in periodicals archive ?
Coverage begins with the International Phonetic Alphabet and ends with dialect differences, in between traversing the particulars of consonants, affricates, vowels, and dipthongs, among other topics.
People speaking English generally pause slightly at the juncture of contiguous vowels not sounded as dipthongs (e.
phoneme Quechua dipthongs /aw/ aw /ai/ ay /yii/ iw ay (before or after q, q', or qh) uy /oi/ uy (before or after q, q', or qh)