Definition of "atopy" [atopy]

• A hereditary disorder marked by the tendency to develop localized immediate hypersensitivity reactions to allergens such as pollen, food etc and is manifested by hay fever, asthma, or similar allergic conditions; generally considered to be caused by the interaction of environmental and genetic factors. (noun)
• A person suffering from atopic syndrome; a case of atopy. (noun)

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• "An immune reaction involving immunoglobulin E IgE antibodies is called atopy."
• "This condition, known as atopy, can be a seasonal problem that recurs year after year, although some dogs suffer all year long."
• ""semi-sterile" environments may develop hyperactive immune systems, a condition referred to as atopy, and increased levels of IgE antibodies directed against common but otherwise nontoxic allergens in the surrounding environment."