discoloration
nounUK /ˌdɪs.kʌl.əˈreɪ.ʃən/
US /ˌdɪs.kʌl.əˈreɪ.ʃən/
A spot or change where something is not its normal color.
The old apple had a brown discoloration on its skin.
OTHER MEANINGS
2. The act of changing something's color, often in a way that is not wanted.
The discoloration of the leaves showed the plant was sick.
3. A patch of color that looks different from the rest of a surface.
There was a yellow discoloration on the white shirt.
4. A change in color caused by damage, age, or chemicals.
The discoloration of the metal came from years of rain.