anaphylaxis

Etymology

coined by Charles Richet and Paul Portier From the Ancient Greek ᾰ̓νᾰ- (ana-, “(intensifier) thoroughly”) from ᾰ̓νᾰ́ (aná, “to, again, upon”) and φύλαξις (phúlaxis, “protection, watching, guarding”).

noun

  1. Extreme sensitivity to a substance such as a foreign protein or drug.
  2. A severe and rapid systemic allergic reaction to an allergen, causing a constriction of the trachea, preventing breathing; anaphylactic shock.

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