saw tooth vs serration

saw tooth

noun
  • A cutting bit of a saw. 

adj
  • Describing a function or waveform that consists of repeated triangular transitions when graphed. 

  • Shaped like a saw tooth. 

serration

noun
  • The state of being serrated. 

  • One of the teeth in a serrated or serrate edge. 

  • A set of teeth or notches. 

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