'Discoloration' definitions:

Definition of 'discoloration'

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]

Definition of 'Discoloration'

From: GCIDE
  • Discoloration \Dis*col`or*a"tion\, n. [Cf. F. decoloration.]
  • 1. The act of discoloring, or the state of being discolored; alteration of hue or appearance. --Darwin. [1913 Webster]
  • 2. A discolored spot; a stain. --Arbuthnot. [1913 Webster]