centrifugal vs radial

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. 

radial

adj
  • Of, or relating to the radius (vein), and/or the wing areas next to it. 

  • Developing uniformly on all sides. 

  • Moving along a radius. 

  • Of, or relating to the radius bone. 

  • Arranged like rays that radiate from, or converge to a common centre. 

noun
  • A radial tire / radial tyre. 

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