| n. | 1. | The act of discoloring, or the state of being discolored; alteration of hue or appearance. |
| 2. | A discolored spot; a stain. |
| Noun | 1. | discoloration - a soiled or discolored appearance; "the wine left a dark stain" Synonyms: discolouration, stain |
| 2. | discoloration - the act of changing the natural color of something by making it duller or dingier or unnatural or faded Synonyms: discolouration |