1842, "treatment of disease by remedies that produce effects opposite to the symptoms," from German Allopathie (Hahnemann), from Greek allos "other" (see alias) + -patheia, "suffering, disease, feeling" (see -pathy). The term applied by homeopathists to traditional medicine.
allopathy in Medicine
allopathy al·lop·a·thy (ə-lŏp'ə-thē) n. A method of treating disease with remedies that produce effects antagonistic to those caused by the disease itself.