Answer: atopy

AnswerCrossword Clue
atopya type of allergy (a state of hypersensitive reaction to certain things)
atopyallergy, involving an inherited immunoglobulin of the IgE type, that predisposes a person to certain allergic responses, as atopic dermatitis
atopya probably hereditary allergy characterized by symptoms (as asthma, hay fever, or hives) produced upon exposure especially by inhalation to the exciting environmental antigen