Hahnemann, Christian Samuel Friedrich. Born in 1755. German physician, the founder of homeopathy, to which he was led by experiments made on himself with Peruvian bark. Hahnemann practiced at Leipzig, but was obliged to retire on account of hostility of the apothecaries there. He was invited to Kothen by the Duke of Anhalt, and afterwards spent eight years in Paris. Hahnemann expounded his system in "Organon of the Healing Art," and other works. Died 1843.