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
food allergy allergic reaction to a substance ingested in food
serum disease,
serum sickness a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum
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Wiktionary
Substantiv
allergy -
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.
allergy -
Any condition of hypersensitivity to a substance.
allergy -
An antipathy, as toward a person or activity.
Wikipedia
Allergy is a hypersensitive disorder of the immune system. Allergic reactions occur to normally harmless environmental substances known as allergens; these reactions are acquired, predictable, and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity.
OmegaWiki Dictionary
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allergy A condition of abnormal sensitivity in certain individuals to contact with substances such as proteins, pollens, bacteria, and certain foods. This contact may result in exaggerated physiologic responses such as hay fever, asthma, and in severe enough situations, anaphylactic shock.\n(Source: KOREN)
