A liquid or semifluid substance that has oozed or been discharged from tissues or blood vessels, often as a result of inflammation.
From Latin excudatus, past participle of excudare (ex- 'out' + sudare 'to sweat'), meaning material that has sweated or oozed out from the body.
When you have an infection or wound that weeps pus or fluid, that's excudate—it's your body's way of trying to heal itself by flushing out infection, so it's actually a good sign.
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