[trif-thawng, -thong, trip-] 
| 1. | Phonetics. 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. | (not in technical use) a trigraph. |
[trif-thawng-guhl, -thong-, trip-] , adjective | triph·thong (trĭf'thông', -thŏng', trĭp'-) n. A compound vowel sound resulting from the succession of three simple ones and functioning as a unit. [tri- + (di)phthong.] triph·thon'gal (-thông'əl, -thŏng'əl) adj. |