trigraph
noun
tri·graph
ˈtrī-ˌgraf 
1
: three letters spelling a single consonant, vowel, or diphthong
eau of beau is a trigraph
2
: a cluster of three successive letters
the, ion, and ing are high frequency trigraphs
Cite this Entry
“Trigraph.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trigraph. Accessed 4 Nov. 2025.
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