'anaphylaxis' originates from Greek, specifically the word 'anaphylaxis,' where 'ana-' meant 'against' and 'phylaxis' meant 'protection.'

'anaphylaxis' was coined in the early 20th century from the Greek roots and became the modern English medical term 'anaphylaxis.'

Initially, it meant 'against protection,' referring to a reaction opposite to immunity, and now it specifically refers to a severe allergic reaction.