|Aristotle (ār'ĭ-stŏt'l) Pronunciation Key
Greek philosopher and scientist who wrote about virtually every area of knowledge, including most of the sciences. Throughout his life he made careful observations, collected specimens, and summarized all the existing knowledge of the natural world. He pioneered the study of zoology, developing a classification system for all animals and making extensive taxonomic studies. His systematic approach later evolved into the basic scientific method in the Western world.