Definition of digraph
1
: a group of two successive letters whose phonetic value is a single sound (such as ea in bread or ng in sing) or whose value is not the sum of a value borne by each in other occurrences (such as ch in chin where the value is \t\ + \sh\)
2
: a group of two successive letters
3
: ligature sense 4
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Merriam-Webster unabridged
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Time Traveler for digraph
The first known use of digraph was in 1780
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