diagraph
/ˈdaɪəˌɡræf/
noun
- A pair of letters representing a single sound, such as 'sh' in 'ship' or 'ph' in 'phone'.
- In English, the diagraph 'th' can be pronounced in two different ways.
- The word 'graph' contains the diagraph 'ph' which makes an /f/ sound.
- Teachers often introduce the 'ch' diagraph when teaching reading.