The term “essential oil” was coined by 16th Century alchemist Paracelsus who thought that these substances contained the quintessence of plants. Centuries earlier, Greek philosophers had proposed that matter appears in four forms (air, earth, fire, and water), and Aristotle had proposed a fifth form—in Latin, the quinta essentia—which would represent the essence of things. To Paracelsus, the oils represented the most concentrated form of the individual characteristics of the plant and that is its essence. (Read More)