digraph

Noun
Synonyms: digram

WordNet 3.0

Noun (1)

  1. two successive letters (especially two letters used to represent a single sound: `sh' in `shoe')Synonyms: digram
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Webster's Dictionary (GCIDE)

Digraph \Di"graph\, n. [Gr. di- = di`s- twice + ? a writing, ? to write.] Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath. [1913 Webster]
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