Diphthong

usgb/ˈdɪfθɔːŋ,ˈdɪpθɔːŋ/
noun

A sound made by combining two vowels, specifically when it starts as one vowel sound and goes to another, like the OI sound in the word 'boil'.

In English, 'ou' in 'house' is a diphthong.
Visual representation of "diphthong" - A sound made by combining two vowels, specifically when it starts as one vowel sound and goes to another, like the OI sound in the word 'boil'.

Often appears as...

  • diphthong vowel
  • falling diphthong

Usage tips

Academic

Definition 1 of 1
Visual representation of "diphthong"
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Pronunciation Practice

Listen to native speakers. Copying their pronunciation can help you master diphthongs.

Illustration for Pronunciation Practice
She practiced saying 'coin' to perfect the diphthong.
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Spelling vs. Sound

Diphthongs may not always be spelled as two vowels next to each other, so focus on sounds, not just letters.

Illustration for Spelling vs. Sound
'Phone' has a diphthong even though it's not obvious from the spelling.
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Varying Diphthongs

Diphthongs can vary in pronunciation across different dialects of English; they're not always pronounced the same.

Illustration for Varying Diphthongs
The diphthong in 'about' sounds different in American and British English.
Visual representation of the word "Diphthong"

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