from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A pair of letters representing a single speech sound, such as the ph in pheasant or the ea in beat.
  • n. A single character consisting of two letters run together and representing a single sound, such as Old English æ.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A directed graph.
  • n. A two-character sequence used to enter a single conceptual character.
  • n. A pair of letters, especially a pair representing a single phoneme.

from the GNU version of the Collaborative International Dictionary of English

  • n. Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath.

from The Century Dictionary and Cyclopedia

  • n. Two letters used to represent one sound, as ea in head, th in path.
  • Consisting of two letters used to represent one sound: as, digraph signs; digraph consonants.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. two successive letters (especially two letters used to represent a single sound: `sh' in `shoe')


Blend of directed and graph. (Wiktionary)
Ancient Greek δίς ("double") + γράφω ("write") (Wiktionary)



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