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Definition of Trigraph
1. 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.
Definition of Trigraph
1. Noun. (linguistics) A specific sequence of three letters, especially one used collectively to represent a single phoneme. ¹
¹ Source: wiktionary.com
Definition of Trigraph
1. a group of three letters representing one sound [n -S]
Medical Definition of Trigraph
1. Three letters united in pronunciation so as to have but one sound, or to form but one syllable, as -ieu in adieu; a triphthong. Origin: Pref. Tri- + -graph. Source: Websters Dictionary (01 Mar 1998)