anaphylaxis /ˌanəfɪˈlaksɪs/

a

I. noun [ mass noun]

1.
[Medicine] an acute allergic reaction to an antigen (e.g. a bee sting) to which the body has become hypersensitive.
– origin early 20th cent.: modern Latin, from Greek ana- ‘again’ + phulaxis ‘guarding’.

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