Adjective
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made hard or flexible or resilient especially by heat treatment
"a sword of tempered steel"
"tempered glass"
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given medical care or treatment
"a treated cold is usually gone in 14 days
if left untreated it lasts two weeks"
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subjected to a physical (or chemical) treatment or action or agent
"the sludge of treated sewage can be used as fertilizer"
"treated timbers resist rot"
"treated fabrics resist wrinkling"