trigraph

noun
tri·​graph | \ˈtrī-ˌgraf \

Definition of trigraph 

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

Other Words from trigraph

trigraphic \(ˌ)trī-​ˈgra-​fik \ adjective

First Known Use of trigraph

circa 1836, in the meaning defined at sense 1

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The first known use of trigraph was circa 1836

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