Relating to a purgative or cleansing treatment applied to or affecting the head.
From Greek 'kephale' (head) + 'katharos' (pure, clean) + '-tic' (relating to). Originally referred to medical treatments meant to purify or purge the head region.
Medieval doctors were obsessed with this idea—they thought headaches and brain fog could be cured by harsh purges to the head, which explains why so many old medical texts focus on treatments that seem absolutely terrifying by modern standards.
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