brow vs cilium

brow

noun
  • The ridge over the eyes; the eyebrow. 

  • A gallery in a coal mine running across the face of the coal. 

  • The forehead. 

  • The first tine of an antler's beam. 

  • The hinged part of a landing craft or ferry which is lowered to form a landing platform; a ramp. 

  • The gangway from ship to shore when a ship is lying alongside a quay. 

  • Aspect; appearance. 

  • The projecting upper edge of a steep place such as a hill. 

verb
  • To bound or limit; to be at, or form, the edge of. 

cilium

noun
  • An eyelash. 

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

  • 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. 

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

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