Past tense or past participle form of discolorate; having had color changed, spoiled, or lost.
Past tense of discolorate, formed by adding -ed. An archaic or literary variant of discolored, less commonly used in modern English.
You're more likely to see 'discolored' than 'discolorated' in modern writing—language gradually simplifies and streamlines, keeping the shorter forms and dropping the longer alternatives.
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