English dictionary
triphthong
/'tr/i/f/T//A//N/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
-
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, <i>eye</i>, <i>-ieu</i> in <i>adieu</i>, <i>-eau</i> in <i>beau</i>, are examples of <i>triphthongs</i>.
Source: webster1913