lampshade vs opacity

lampshade

noun
  • A cover over a lamp to either diffuse the light or to block it in certain directions to avoid glare in the eyes. 

verb
  • To wear an oversize top with skintight thigh-high boots and no leggings. 

  • To design or create lampshades. 

  • To intentionally call attention to the improbable, incongruent, or clichéd nature of an element or situation featured in a work of fiction within the work itself. 

  • To adorn with one or more lampshades. 

opacity

noun
  • The state or quality of being opaque, not allowing light to pass through 

  • The state or quality of being inaccessible to understanding. 

  • A measure of relative impenetrability to electromagnetic radiation such as light. 

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