WordReference Random House Unabridged Dictionary of American English © 2016
triph•thong  (trifthông, -thong, trip-), 
  1. Phonetics[Phonet.]a monosyllabic speech-sound sequence perceived as being made up of three differing vowel qualities, as the pronunciation of our, esp. in r-dropping dialects.
  2. Linguistics(not in technical use) a trigraph.
Etymology:1590–1600; Neo-Latin triphthongus Medieval Greek tríphthongos with three vowels, equivalent. to tri- tri- + phthóngos voice, sound
triph•thong•al  (trif thônggəl, -thong-, trip-), 

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:

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