caseation vs thinning

caseation

noun
  • A necrotic degeneration of tissue to a cheese-like condition. 

thinning

adj
  • Becoming less thick, dense, or numerous 

noun
  • Wood, leaves, or other plant parts removed during the process of thinning 

  • The action or result of reducing thickness, density, or number 

  • Process of removing plants or parts of plants to facilitate the growth of other plants 

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