Search Result for "hypersensitivity reaction":
Wordnet 3.0

NOUN (1)

1. 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; 



WordNet (r) 3.0 (2006):

hypersensitivity reaction
    n 1: 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