Sensitivity to Seafood, Peanuts, Pollen

Word Meaning:

ALLERGY — (medicine, immunology, loosely) 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.

Definitions from Wiktionary.