A substance that prevents or opposes anaphylactic shock (a severe allergic reaction).
Combines 'anti-' with 'anaphylactogen' (from Greek 'ana-' back, 'phylaxis' protection, and 'gen' producer). Emerged in early 20th-century allergy and immunology research.
Anaphylaxis was named as the opposite of phylaxis (protection)—it's a violent overreaction—and scientists created 'antianaphylactogen' to name substances that could prevent this life-threatening response, showing how medical language races to catch up with dangerous phenomena.
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