Relating to a severe, potentially life-threatening allergic reaction that happens suddenly after exposure to a trigger like peanuts or bee stings.
From Greek 'ana-' (against) plus 'phylaxis' (guarding or protection), formed in the early 1900s by scientist Paul Portier. The prefix combination literally means 'against protection.'
Anaphylaxis happens because the immune system massively overreacts—it's like your body's security system mistaking a peanut for a home invader and calling in the military!
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