stain

stain (http://definr.com/stain)

     n 1: a soiled or discolored appearance; "the wine left a dark
          stain" [syn: discoloration, discolouration]
     2: a dye or other coloring material that is used in microscopy
        to make structures visible
     3: the state of being covered with unclean things [syn: dirt,
         filth, grime, soil, grease, grunge]
     4: a symbol of disgrace or infamy; "And the Lord set a mark
        upon Cain"--Genesis [syn: mark, stigma, brand]
     5: an act that brings discredit to the person who does it; "he
        made a huge blot on his copybook" [syn: blot, smear, smirch,
         spot]
     v 1: color with a liquid dye or tint; "Stain this table a
          beautiful walnut color"; "people knew how to stain glass
          a beautiful blue in the middle ages"
     2: produce or leave stains; "Red wine stains the table cloth"
     3: color for microscopic study; "The laboratory worker dyed the
        specimen"