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discoloration /dɪsˌkʌləˈreɪʃən/  

  • noun
    plural -tions
    [noncount] :the act of changing color in a bad way
    The medicine may cause discoloration [=stainingof the teeth.
    [count] :a discolored spot or area
    His shirt has a small discoloration [=stainon the sleeve.