Triphthong

In phonetics, a triphthong ŋ (from Greek τρίφθογγος, `triphthongos`, literally `with three sounds,` or `with three tones`) is a monosyllabic vowel combination involving a quick but smooth movement of the articulator from one vowel quality to another that passes over a third. While `pure` vowels, or monophthongs, are said to have...
Found on http://en.wikipedia.org/wiki/Triphthong

Triphthong

• (n.) A combination of three vowel sounds in a single syllable, forming a simple or compound sound; also, a union of three vowel characters, representing together a single sound; a trigraph; as, eye, -ieu in adieu, -eau in beau, are examples of triphthongs.
Found on http://thinkexist.com/dictionary/meaning/triphthong/

triphthong

The actual name of a three letter diphthong, or, a combination of letters that furthermore trips up speech.
Found on http://www.translationdirectory.com/glossaries/glossary141.htm

triphthong

three vowel sounds pronounced as one
Found on http://phrontistery.info/t.html

triphthong

triphthong A combination of three vowels forming a single or compound sound; such as, ieu in lieu, eau in beauty, etc.
Found on http://www.wordinfo.info/words/index/info/view_unit/2740/10
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