IPA: /dɪsˌkʌləˈreɪʃən/
KK: /dɪsˌkʌləˈreɪʃən/
A change in color that makes something look different, often due to a stain or damage.
The shirt had a noticeable discoloration after being washed with bleach.
Discoloration is formed from "dis-" (meaning apart or away) and "color" (from Latin "color", meaning hue or appearance) and "-ation" (a suffix used to form nouns indicating an action or resulting state). The word refers to the state of having a color that is different from the original or normal hue, suggesting a change or removal of the original color.
Think of 'dis-' meaning 'apart' and 'color' referring to 'hue' — discoloration means a change that takes the original color away.