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This page is a spellcheck for word diphthong. All Which is Correct spellings and definitions, including "Diphthong or diptong" are based on official English dictionaries, which means you can browse our website with confidence! Common searches that lead to this page: how to spell diphthong, correct spelling of diphthong, how is diphthong spelled, spell check diphthong, how do you spell diphthong.