tri·graph noun \ˈtrī-ˌgraf\
: three letters spelling a single consonant, vowel, or diphthong <eau of beau is a trigraph>
: 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
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