crenate vs runcinate

crenate

adj
  • Having round or blunt teeth on its margin; scalloped. 

noun
  • Any salt or ester of crenic acid 

runcinate

adj
  • Having tooth-like projections pointing away from the apex. 

  • Having a lacerated aspect with the projection pointing away from the apex, like dandelion leaves. 

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