pharmacognosy       
noun [ U ]  medical specialized uk/ˌfɑː.məˈkɒɡ.nə.si/ us/ˌfɑːr.məˈkɑːɡ.nə.si/
 生药学
the study of medical drugs obtained from plants, animals, and microbes (= very small living things that can only be seen under a microscope)
  He is a professor of pharmacognosy at the University of Illinois at Chicago. 他是芝加哥的伊利诺斯大学的生药学教授。 
 The book covers the unique and rich history of pharmacognosy in pharmacy practice. 这本书覆盖了生药学在药学实践中独特而丰富的历史。 
 - More examples
 - “Pharmacognosy” derives from two Greek words, “pharmakon” or drug, and “gnosis” or knowledge.
 - In pharmacognosy, fructus is not always synonymous with the botanical definition.
 - Today, the subject matter contained in this branch of science is taught under the heading of several specialized fields, such as pharmacology, pharmacognosy, and drug analysis of various types.