centrifugal vs diffusive

centrifugal

adj
  • Tending, or causing, to recede from the center. 

  • Expanding first at the summit, and later at the base, as a flower cluster. 

  • Having the radicle turned toward the sides of the fruit, as some embryos. 

noun
  • A rotating machine used to separate massecuite into sugar crystals and molasses. 

diffusive

adj
  • That diffuses something; disseminating. 

  • That is spread or dispersed across a wide area or among a large number of people. 

  • Involving or employing many words; expansive, discursive; (in negative sense) long-winded. 

  • Pertaining to diffusion. 

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