(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). triphthong. Retrieved September 20, 2026, from http://smartdefine.org/triphthong/definitions/2074816 |
| Chicago | Webster's. 2011. "triphthong" http://smartdefine.org/triphthong/definitions/2074816 (accessed September 20, 2026). |
| Harvard | Webster's 2011, triphthong, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/triphthong/definitions/2074816>. |
| MLA | Webster's. "triphthong" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/triphthong/definitions/2074816> |