A tetragraph, from Greek τετρα (tetra) 'four', is a sequence of four letters used to represent a single sound (phoneme), or a combination of sounds, that do not necessarily correspond to the individual values of the letters. In German, for example, the tetragraph tsch represents the sound of the English digraph ch.
A tetragraph, from Greek τετρα (tetra) 'four', is a sequence of four letters used to represent a single sound (phoneme), or a combination of sounds, that do not necessarily correspond to the individual values of the letters. In German, for example, the tetragraph tsch represents the sound of the English digraph ch.
Source: Wikipedia "Tetragraph" · CC BY-SA 4.0
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