(n.) Three letters united in pronunciation so as to have but one sound or to form but one syllable, as -ieu in adieu; a triphthong.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Trigraph. Retrieved September 25, 2026, from http://smartdefine.org/trigraph/definitions/2074681 |
| Chicago | Webster's. 2011. "Trigraph" http://smartdefine.org/trigraph/definitions/2074681 (accessed September 25, 2026). |
| Harvard | Webster's 2011, Trigraph, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/trigraph/definitions/2074681>. |
| MLA | Webster's. "Trigraph" 28 May 2011. Web. 25 September 2026. <http://smartdefine.org/trigraph/definitions/2074681> |