A substance inhaled through the nose to stimulate sneezing or clear nasal passages, used in old medical practice.
From Greek 'errhinon', combining 'er-' (into) and 'rhis' (nose). Medieval and ancient physicians used errhines as medical treatments.
Ancient doctors thought sneezing was actually healthy and would make patients sniff pepper, mustard, or other irritants—an 'errhine' wasn't about comfort, it was treatment!
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