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Noun: discolouration  dis,kú-lu'rey-shun
Usage: Brit, Cdn (US: discoloration)
  1. A soiled or discoloured appearance
    "the wine left a dark discolouration";
    - stain, discoloration
  2. The act of changing the natural colour of something by making it duller, dingier, unnatural or faded
    - discoloration

Derived forms: discolourations

Type of: appearance, change of color [US], change of colour [Brit, Cdn], visual aspect