cilium vs cowlick

cilium

noun
  • Hairs or similar protrusions along the margin of an organ. 

  • One of the fine hairs along an insect's wing. 

  • An eyelash. 

  • A short microscopic hairlike organelle projecting from a eukaryotic cell (such as a unicellular organism or one cell of a multicelled organism) which serve either for propulsion by causing currents in the surrounding fluid or as sensors. 

cowlick

noun
  • An unruly lock or section of hair that sticks straight out from the skull or lies at an angle at odds with the rest of an individual's hair, like a whorl or vortex. 

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