To form an abscess or swelling; to suppurate or discharge pus in the manner of an abscess.
From aposteme (abscess) + the verbal suffix -ate. Meaning the process of becoming or developing into an abscess with purulent matter.
Medieval physicians would describe infections as 'apostemating' as a way of explaining that the body's natural healing process was underway—they didn't yet understand bacteria, so they interpreted pus formation as the body expelling corrupted matter.
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