cilium vs eyebrow

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. 

eyebrow

noun
  • The hair that grows over the bone ridge above the eye socket. 

  • A dormer, usually of small size, whose roof line over the upright face is typically an arched curve, turning into a reverse curve to meet the horizontal line at either end. 

  • A clump of waste fibres that builds up in a roller machine. 

verb
  • To build up waste fibres in a roller machine. 

  • To signal with one's eyebrows. 

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