Search Result for "digraph":
Wordnet 3.0

NOUN (1)

1. two successive letters (especially two letters used to represent a single sound: `sh' in `shoe');
[syn: digraph, digram]



The Collaborative International Dictionary of English v.0.48:

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]