'Digram' definitions:
Definition of 'digram'
(from WordNet)
noun
Two successive letters (especially two letters used to represent a single sound: `sh' in `shoe') [syn: digraph, digram]
Definition of 'Digram'
From: GCIDE
- Digram \Di"gram\, n. [Gr. di- = di`s- twice + ? letter.] A digraph. [1913 Webster]