di·a·crit·ic /ˌdaɪəˈkrɪtɪk/
  (a.)可區別的;讀音符號
  Di·a·crit·ic Di·a·crit·ic·al a.  That separates or distinguishes; -- applied to points or marks used to distinguish letters of similar form, or different sounds of the same letter, as, ā, ă, ä, ō, ŏ, etc. “Diacritical points.”
     A glance at this typography will reveal great difficulties, which diacritical marks necessarily throw in the way of both printer and writer.   --A. J. Ellis.
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  diacritic
       adj : capable of distinguishing; "students having superior
             diacritic powers"; "the diacritic elements in culture"-
             S.F.Nadel [syn: diacritical]
       n : a mark added to a letter to indicate a special pronunciation
           [syn: diacritical mark]