A substance that counteracts or neutralizes an antidote, effectively canceling out the cure.
From Greek 'anti-' (against) + 'antidote' (itself from 'anti-' + 'didonai', to give). This paradoxical term is rare but was used in historical pharmacology and toxicology contexts.
This word is almost never used in real medicine because it describes an impossible situation—why would anyone create something that undoes a cure?—but it shows how clever language can describe even unlikely scenarios.
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