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"Atopy" Definition
noun
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.
A probably hereditary allergy characterized by symptoms (as asthma, hay fever, or hives) produced upon exposure especially by inhalation to the exciting environmental antigen.