medicinal vs placebo

medicinal

noun
  • Any plant that can be used for medicinal purposes. 

adj
  • Having the properties of medicine, or pertaining to medicine; medical. 

  • Tasting like medicine; particularly of unpleasant or artificial sweet or bitter flavours similar to cherry, almond or licorice. 

  • Tending or used to cure disease or relieve pain. 

placebo

noun
  • A dummy medicine containing no active ingredients; an inert treatment. 

  • The vespers sung in the office for the dead. 

How often have the words medicinal and placebo occurred in a corpus of books? (source: Google Ngram Viewer )