heliotrope vs purpure

heliotrope

noun
  • A light purple or violet colour. 

  • Particularly, a purple-flowered plant of the species Heliotropium arborescens. 

  • A bloodstone (a variety of quartz). 

  • An instrument, employed in triangulation, that uses a mirror to reflect sunlight toward another, very distant, surveyor. 

  • The fragrance of heliotrope flowers. 

  • A plant that turns so that it faces the sun. 

adj
  • Light purple or violet. 

  • Keeping one’s face turned toward the sun. 

purpure

noun
  • purpure 

  • A purple colour on a coat of arms, represented in engraving by diagonal parallel lines 45 degrees clockwise. 

adj
  • In blazon, of the colour purple. 

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