Excessive or abnormal sweating, or perspiration of blood in medical terminology.
From Greek epi 'upon' and hidrosis 'sweating,' from hidros 'sweat'—excessive sweating or the medical condition of sweating beyond normal.
In medieval and ancient medical texts, ephidrosis—especially 'bloody sweat'—was considered a sign of extreme divine favor or punishment, though modern medicine understands it as a stress-related medical condition.
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