diacritic(n = noun.communication) diacritical mark - a mark added to a letter to indicate a special pronunciation;
is a kind of mark
has particulars: accent, accent mark, breve, cedilla, circumflex, hacek, wedge, macron, tilde, diaeresis, dieresis, umlaut
Derived forms adjective diacritic₁, adjective diacritical₁

   diacritic(s = adj.all) diacritical - capable of distinguishing; "students having superior diacritic powers"; "the diacritic elements in culture"
Derived form noun diacritic₁

diacritic, n. & adj.
--n. a sign (e.g. an accent, diaeresis, cedilla) used to indicate different sounds or values of a letter.
--adj. = DIACRITICAL.

Etymology:
Gk diakritikos (as DIA-, CRITIC)