Noun: hypersensitivity reaction
- An inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
"His hypersensitivity reaction to bee stings necessitated carrying an epinephrine auto-injector"
Derived forms: hypersensitivity reactions
Type of: hypersensitivity
Encyclopedia: Hypersensitivity reaction