[dahy-graf, -grahf]
a pair of letters representing a single speech sound, as ea in meat or th in path.

1780–90; di-1 + -graph

digraphic [dahy-graf-ik] , adjective
digraphically, adverb
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World English Dictionary
digraph (ˈdaɪɡrɑːf, -ɡræf)
ligature Compare diphthong a combination of two letters or characters used to represent a single speech sound such as gh in English tough

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The term digraph is used here in its broadest sense, not in the restricted sense of phonetics.
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