a mark such as an accent, 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
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NAmE//ˌdaɪəˈkrɪt̮ɪkl//
adjective diacritical marksSee diacritic in the Oxford Advanced Learner's DictionaryCheck pronunciation: diacritic