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1. A pair of letters representing a single speech sound, such as the ph in pheasant or the ea in beat.
2. A single character consisting of two letters run together and representing a single sound, such as Old English æ.

di·graph′ic (dī-grăf′ĭk) adj.
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It was a digraphic (two letters at a time) cipher known as a Playfair after its nineteenth-century inventor.