allergy

noun

Etymology: Etymology tree Proto-Indo-European *h₂el- Proto-Indo-European *h₂élyos Proto-Hellenic *áľľos Ancient Greek ᾰ̓́λλος (ắllos) Proto-Indo-European *werǵ- Proto-Indo-European *-om Proto-Indo-European *wérǵom Proto-Hellenic *wérgon Ancient Greek ἔργον (érgon) German Allergiebor. English allergy Borrowed from German Allergie. Coined by Austrian pediatrician Clemens von Pirquet in 1906 from Ancient Greek ἄλλος (állos, “other”) + ἔργον (érgon, “work, activity”), on the model of Energie.

1. A disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma; any condition of hypersensitivity to a substance.

   “My dad can't live with pets because of an allergy.”

2. A disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma; any condition of hypersensitivity to a substance.
3. An antipathy, as toward a person or activity.

   “He has an allergy to reality TV.”