Meaning of HYPERSENSITIVITY REACTION

WordNet Dictionary
	Definition:		[n]  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
	See Also:		allergic reaction, allergic rhinitis, allergy, anaphylaxis, hives, hypersensitivity, nettle rash, urticaria, urtication