Webster's Revised Unabridged Dictionary · 1913

Isopathy

Isopathy , noun

[Iso- + Greek {not transcribed} suffering.]

(a)
(Medicine) The system which undertakes to cure a disease by means of the virus of the same disease.
(b)
(Medicine) The theory of curing a diseased organ by eating the analogous organ of a healthy animal.
(c)
(Medicine) The doctrine that the power of therapeutics is equal to that of the causes of disease. — Mayne