madstone vs phylactery

madstone

noun
  • A stone believed to have the power to heal the bite of a rabid or venomous animal. 

phylactery

noun
  • Any small object worn for its magical or supernatural power; an amulet or charm. 

  • Either of the two small leather cases, containing biblical scrolls, worn by Jewish men at morning prayer; the tefilla. 

  • A case in which (Christian) relics were preserved. 

  • An enspelled object used (by such as a lich) to contain and protect the owner's soul. 

  • A speech scroll, an illustrative device depicting speech, song or other sound as if written on a scroll. 

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