A substance that neutralizes or counteracts an antitoxin, which was originally meant to block a toxin.
From Greek 'anti-' (against) + 'antitoxin' (from 'anti-' + 'toxin', from Latin 'toxicum' meaning poison). This medical term arose from early immunology when scientists discovered the complex ways the immune system regulates itself.
When doctors inject an antitoxin to save someone from poison, theoretically an antiantitoxin could undo the cure—but in reality, the immune system has built-in safety checks to prevent this dangerous loop from happening.
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