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)