trigraph


tri·graph

noun \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>
tri·graph·ic \(ˌ)trī-ˈgra-fik\ adjective

First Known Use of TRIGRAPH

circa 1836

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