trigraph

(trīgraf′)

noun

a group of three letters representing one sound (Ex.: pph in Sappho)

Origin: tri- + -graph

See trigraph in American Heritage Dictionary 4

noun
  1. Three letters spelling one consonant, vowel, or diphthong, such as Sch in Schiller or igh in high or thigh.
  2. A group of three letters, especially of frequent occurrence in a given language, as the or ing in English or gli in Italian.
  3. Any combination of three letters of an alphabet. Also called trigram.

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