Collins Concise English Dictionary © HarperCollins Publishers::

triphthong /ˈtrɪfθɒŋ ˈtrɪp-/ n
  1. a composite vowel sound during the articulation of which the vocal organs move from one position through a second, ending in a third
  2. a trigraph representing a composite vowel sound such as this
Etymology: 16th Century: via New Latin from Medieval Greek triphthongos, from tri- + phthongos sound; compare diphthong

triphˈthongal adj

'triphthong' also found in these entries:
In the English description:

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