red·ness /-nəs/
  紅,紅色
  Red·ness, n.  The quality or state of being red; red color.
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  redness
       n 1: a response of body tissues to injury or irritation;
            characterized by pain and swelling and redness and heat
            [syn: inflammation, rubor]
       2: the quality or state of the chromatic color resembling the
          hue of blood [syn: red]