crystal vs glazing

crystal

noun
  • The glass over the dial of a watch case. 

  • A fine type of glassware, or the material used to make it. 

  • Crystal meth: methamphetamine hydrochloride. 

  • A solid composed of an array of atoms or molecules possessing long-range order and arranged in a pattern which is periodic in three dimensions. 

  • A piece of glimmering, shining mineral resembling ice or glass. 

adj
  • Very clear. 

  • "Do I make myself clear?" / "Crystal." 

glazing

noun
  • The part of a window or wall made of glass or another transparent material. 

  • The act or process of glazing or an instance thereof. 

  • All the windows of a building. 

  • The art of covering with a vitreous substance. 

  • The material used in such act or process; glaze. 

  • Semi-transparent colours painted thinly over others to modify the effect. 

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