Noun
Chemistry applied to, or used in, medicine; -- used especially with reference to the doctrines in the school of physicians in Flanders, in the 17th century, who held that health depends upon the proper chemical relations of the fluids of the body, and who endeavored to explain the conditions of health or disease by chemical principles.
Source: Webster's dictionaryP.9 Iatrochemistry also refers to the pharmaceutical applications of alchemy championed by Paracelsus. Source: Internet