Definition of trigraph in English:

trigraph

noun

  • A group of three letters representing one sound, for example German sch-

    • ‘If three letters together represent a single sound, they constitute a trigraph, such as tch in catch and sch in schmaltz.’
    • ‘Similarly, to take the consonant trigraph t c h, the teacher can explain that in this word the three letters together ‘say’ the sound.’
    • ‘Both digraphs and trigraphs in French have their origin in history and phonology.’

Pronunciation:

trigraph

/ˈtrīˌɡraf/