Pharmacognosy's the study of medicines derived from natural sources. The American Society of Pharmacognosy defines pharmacognosy as "the study of the physical, chemical, biochemical and biological properties of drugs, drug substances or potential drugs or drug substances of natural origin as well as the search for new drugs from natural sources." Introduction The word "pharmacognosy" derives from the Greek words pharmakon (drug), and gnosis or "knowledge". The term pharmacognosy was used for th… (More on Pharmacognosy)