Webster's English Dictionary

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digraph

di.graph \'di--.graf\ \di--'graf-ik\ \-'graf-i-k(*-)le-\ n 1: a group of 
   two successive letters whose phonetic value is a single sound  (as ea in 
   bread) or whose value is not the sum of a value borne by each in other 
   occurrences (as ch in chin) 2: a group of two successive letters  - 
   di.graph.ic aj