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Diagraph (noun)
A drawing instrument that combines a protractor and scale.
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Digraph (noun)
A directed graph.
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Digraph (noun)
A two-character sequence used to enter a single conceptual character.
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Digraph (noun)
A pair of letters, especially a pair representing a single phoneme.
Wiktionary
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Digraph (noun)
a combination of two letters representing one sound, as in ph and ey.
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Digraph (noun)
a character consisting of two joined letters; a ligature.
Oxford Dictionary