2. A method of treating a disease by introducing a condition that is intended to cause a pathologic reaction which will be antagonistic to the condition being treated.
3. A system of medicine in which disease is treated by producing effects opposed to or incompatible with the effects of the disease process.
4. A method of treating disease with remedies that produce effects different from those caused by the disease itself.
5. The system of medical practice which treats disease by the use of remedies which produce effects different from those produced by the disease under treatment. Medical doctors are said to practice allopathic medicine.
The term "allopathy" was coined in 1842 by C.F.S. Hahnemann to designate the usual, or normal, practice of medicine (allopathy) as opposed to homeopathy, the system of therapy that he founded based on the concept that disease can be treated with drugs (in minute doses) and so produce the same symptoms in healthy people as the disease itself.