Diacritic (noun, adjective)
1. Also called diacritical mark. a mark, point, or sign added or attached to a letter or character to distinguish it from another of similar form, to give it a particular phonetic value, to indicate stress, etc., as a cedilla, tilde, circumflex, or macron.
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Origin: 1670-80; < Greek diakritikós distinctive, equivalent to dia- dia- + kritikós; see critic
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