noun
EXAMPLES FROM CORPUS
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A frequent fault is making the diphthongs too long: each element is too clearly articulated.
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In 1835 the oi diphthong was systematically changed to ai in accordance with modern pronunciation in words like françois.
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The next two diphthongs are almost exactly the opposite of each other and therefore less likely to be confused.
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The sounds of hate, bee, high, bone, few, are the basic diphthongs.
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You may have noticed that I have not suggested any intensive practice specifically on vowels or their different combinations into diphthongs.