'discolouration' definitions:
Definition of 'discolouration'
(from WordNet)
noun
A soiled or discolored appearance; "the wine left a dark stain" [syn: stain, discoloration, discolouration]
noun
The act of changing the natural color of something by making it duller or dingier or unnatural or faded [syn: discoloration, discolouration]