algidity vs refrigeration

algidity

noun
  • The state of being algid. 

refrigeration

noun
  • The process of preserving something by cooling. 

  • The process of transferring heat from an object in order to cool it. 

  • The cooling of the body for therapeutic purposes. 

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