noun
A speech sound or glide that begins with one vowel sound and moves through a second to end in a third, such as the sounds represented by the vowels in 'ire,' 'your,' and 'lower.'
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A triphthong is a combination of three vowel sounds in a single syllable.
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I learned about triphthongs in my linguistics class and found them quite interesting.
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I have no idea what a triphthong is, sounds like some kind of alien language.
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The triphthong of emotions she felt was evident in her tear-streaked face.