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Entry 2 senses Webster, 1913

Monophthong

· Mon·oph·thong · IPA /ˈmɑnəfˌθɔŋ/
01 n. A single uncompounded vowel sound.
  1. 1.
    A single uncompounded vowel sound.
  2. 2.
    A combination of two written vowels pronounced as one; a digraph.