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Definition of diphthong:

  1. A coalition or union of two vowel sounds pronounced in one syllable; as, ou in out, oi in noise; - called a proper diphthong.
  2. A vowel digraph; a union of two vowels in the same syllable, only one of them being sounded; as, ai in rain, eo in people; - called an improper diphthong.
  3. To form or pronounce as a diphthong; diphthongize.

Synonyms:

aspiration, affricate, close vowel, assonance, bilabial, closed syllable, alveolar, aspirate, consonant.

Usage examples: