homeopathy

Concise Oxford English Dictionary © 2008 Oxford University Press:
homeopathy /ˌhəʊmɪˈɒpəθi, hɒm-/ (also homoeopathy)

▶noun a system of complementary medicine in which symptoms are treated with minute doses of disease-causing natural substances. Often contrasted with allopathy.

– derivatives
homeopathic adjective,
homeopathically adverb,
homeopathist noun.

– origin C19: coined in Ger. from Gk homoios ‘like’ + patheia (see -pathy).