DISCOLORATION
discoloration, discolouration
(noun) the act of changing the natural color of something by making it duller or dingier or unnatural or faded
stain, discoloration, discolouration
(noun) a soiled or discolored appearance; “the wine left a dark stain”
Source: WordNet® 3.1
Etymology
Noun
discoloration (countable and uncountable, plural discolorations)
The act of discoloring, or the state of being discolored; alteration of hue or appearance.
A discolored spot; a stain.
Source: Wiktionary
Dis*col`or*a"tion, n. Etym: [Cf. F. decoloration.]
1. The act of discoloring, or the state of being discolored;
alteration of hue or appearance. Darwin.
2. A discolored spot; a stain. Arbuthnot.
Source: Webster’s Unabridged Dictionary 1913 Edition