1. A union of two letters representing only one sound, as ea in head, and ph in phial.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• bigraphy,
• diagraph,
• digram,
• digrace,
• diagrapm,
• biograph,
• diagraphs,
• dybrach,
• deigraph,
• digrapph,
• digraphh,
• Dyagraph,
• Digliph,
• digrahic,
• ediograph,
• Migilph,
• onmigraph,
• dicograph,
• duoyraph,
• doograph

• disrepute,
• -graph,
• graph,
• disrupt,
• disrepair,
• disrupted.

The adjective form of the word "digraph" is "digraphic".

The plural of the "digraph" can be the "digraphs".

The singular of the "digraph" can be the "digraph".