Usually means: Two vowels blending incorrectly phonetically.
Definitions Related words Mentions
We found 5 dictionaries that define the word improper diphthong:

General (5 matching dictionaries)
  1. improper diphthong: Merriam-Webster
  2. improper diphthong: Wordnik
  3. improper diphthong: Dictionary.com
  4. improper diphthong: FreeDictionary.org
  5. Improper diphthong: TheFreeDictionary.com

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