Simple past tense and past participle of alter.(verb)
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Use "altered" in a sentence
"His expression altered subtly, his gaze becoming both lambent and predatory."
"However, when Basilisco looked at those with what he calls "altered somatization," he found that "patients with altered somatization are four times more likely to report lactose intolerance.""
"Lord Chancellor, and increased in acerbity as he described what he called the altered mind of his honourable and learned friend the"