This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

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.

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.

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

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.

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

"Digraphs: The digraph is a two-letter "country code" that precisely identifies every entity without overlap, duplication, or omission."

letter    letter of the alphabet    alphabetic character   

ligature    diphthong   

subgraph    hypergraph    irm    bilayer    chromophore    carbanion    embedding    triphthong    mwyn    if