تعريف diacritical mark في الإنجليزية الإنجليزية القاموس.
: A symbol in writing used with a letter to indicate a different pronunciation, stress, tone, or meaning, also called "tone marks" when used to indicate tones, e.g. in Vietnamese or pinyin (romanticized Chinese Mandarin)
{i} accent mark, mark placed above or below a letter to show how it is to be pronounced (used in Arabic, Spanish, etc.)