\I*sop"a*thy\, n. [Iso- + Gr. ? suffering.] (Med.)
(a) The system which undertakes to cure a disease by means of
    the virus of the same disease.
(b) The theory of curing a diseased organ by eating the
    analogous organ of a healthy animal. --Mayne.
(c) The doctrine that the power of therapeutics is equal to
    that of the causes of disease.