Atopy is a medical condition characterized by the tendency to develop allergic reactions such as asthma, eczema, and hay fever. There are a few synonyms that can be used interchangeably with atopy. One such synonym is allergic disease, which refers to any disease caused by an allergic reaction. Another synonym is hypersensitivity, which refers to an excessive or abnormal reaction of the immune system to a foreign substance. Other synonyms for atopy include allergy, sensitization, and reactivity. These terms are often used by doctors and researchers in the field of allergy and immunology to describe the various manifestations of atopy in patients.