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Entry 2 senses · 2 variants Webster, 1913

Diphthong

/(?; 115, 277)/ · Diph·thong · IPA /ˈdɪpˌθɔŋ/
01 n. A coalition or union of two vowel sounds pronounced in one syllable; as, ou in out, oi in noise; -- called a proper diphthong.
  1. 1.
    A coalition or union of two vowel sounds pronounced in one syllable; as, ou in out, oi in noise; -- called a proper diphthong.(Orthoëpy)
02 v. t. To form or pronounce as a diphthong; diphthongize.
  1. 1.
    To form or pronounce as a diphthong; diphthongize.[R.]