medicinal vs therapeutical

medicinal

adj
  • Tending or used to cure disease or relieve pain. 

  • 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. 

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

therapeutical

adj
  • therapeutic 

noun
  • Such an agent 

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