An abnormal reaction by the body that is provoked by certain substances, including pollen, dust, car exhaust fumes, certain foods and drugs, fur, moulds, etc. Allergic conditions include hay fever , some forms of asthma and dermatitis , and urticaria .
Treatment includes the use of antihistamines , corticosteroids, and desensitization .
The Macmillan Encyclopedia 2001 3. The New Penguin Dictionary of Science 5. All rights reserved.