Poisoning or sickness caused by hellebore; the medical condition resulting from hellebore toxicity.
From 'hellebore' plus the suffix '-ism' (denoting a condition or disease). Emerged in medical terminology when doctors needed to distinguish hellebore poisoning from other toxifications.
Creating a disease name 'helleborism' shows that doctors took hellebore poisoning seriously as a specific syndrome—even though it was often them causing it by giving it as medicine!
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