Definition of trigraph noun from the Oxford Advanced Learner's Dictionary

 

trigraph

 noun
noun
BrE BrE//ˈtraɪɡrɑːf//
 
; NAmE NAmE//ˈtraɪɡræf//
 
(linguistics)
 
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a combination of three letters representing one sound, for example sch in German
See the Oxford Advanced American Dictionary entry: trigraph