ˈad.əpē, -pi noun
( -es )
Etymology: Greek atopia unusualness, from atopos out of the way, unusual + -ia -y
1. : a probably hereditary allergy characterized by symptoms (as hay fever, asthma, or hives) produced upon exposure to the exciting antigen without inoculation
2. : hypersensitivity in which reagin is formed in place of the usual precipitins or agglutinins