noun
a complex speech sound or glide that begins with one vowel sound and changes to another within the same syllable, as (oi) in oil or (ai) in pain
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The linguist explained the concept of diphthong in great detail during the lecture.
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I still don't quite get how to pronounce that diphthong correctly.
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Yo, did you hear that diphthong in the song? It sounded so cool!
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The diphthong of emotions in her voice made it clear how conflicted she was.