Definition of Diffusive:
The term diffusive generally refers to any agent that has a powerful, rapid, and sometimes transient effect on the body through the nervous system. This impression can often first be felt upon the tongue as a tingly sensation, as with Echinacea, Wild Ginger, Bayberry or Prickly Ash. The opposite of Diffusive is Permanent, which refers to those plants which act on the body in a slower, less jolting and more persistent manner. This especially applies to many nourishing herbs such as Milky Oats but can also be felt in many, many other plants [bearmedicineherbals].