mirror vs pierglass

mirror

noun
  • A mirror carp. 

  • An object, person, or event that reflects or gives a picture of another. 

  • A disk, website or other resource that contains replicated data. 

  • A kind of political self-help book, advising kings, princes, etc. on how to behave. 

  • A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it. 

verb
  • Of an event, activity, behaviour, etc, to be identical to; to be a copy of. 

  • To reflect, as in a mirror. 

  • To create something identical to (a web site, etc.). 

pierglass

noun
  • A tall narrow mirror, usually set between two windows, above a pier table 

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