ague vs gelidity

ague

verb
  • To strike with an ague, or with a cold fit. 

noun
  • The cold fit or rigor of the intermittent fever 

  • A chill, or state of shaking, as with cold. 

  • An intermittent fever, attended by alternate cold and hot fits. 

gelidity

noun
  • The state or quality of being gelid. 

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