Real Dictionary

homeopathy
uncountable noun: Homeopathy is a way of treating an illness in which the patient is given very small amounts of a drug that produces signs of the illness in healthy people.

homeopathy in American English
a system of medical treatment based on the theory that certain diseases can be cured by giving very small doses of drugs which in a healthy person would produce symptoms like those of the disease
noun: the method of treating disease by drugs, given in minute doses, that would produce in a healthy person symptoms similar to those of the disease (opposed to allopathy)

homeopathy in British English
noun: a method of treating disease by the use of small amounts of a drug that, in healthy persons, produces symptoms similar to those of the disease being treated