单词	triphthong
释义	triphthong noun triph·​thong ˈtrif-ˌthȯŋ  ˈtrip- 1 : a phonological unit consisting of three successive vocalic sounds in one syllable 2 : trigraph triphthongal trif-ˈthȯŋ-gəl  trip- -əl adjective Word History Etymology tri- + -phthong (as in diphthong) First Known Use circa 1599, in the meaning defined at sense 1
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