diacritical
adjective /ˌdaɪəˈkrɪtɪkl/
/ˌdaɪəˈkrɪtɪkl/
(linguistics)- used to describe marks such as accents, placed over, under or through a letter in some languages, to show that the letter should be pronounced in a different way from the same letter without a mark
- diacritical marks