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spline noun

  /splaɪn/
  • A rectangular piece that fits grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together.
  • (mechanics) Ridges or teeth on a drive shaft that mesh with grooves in a mating piece and transfer torque to it, maintaining the angular correspondence between them.
 chiavetta, cuneo
  • (woodworking) A strip of wood or other material inserted into grooves in each of two pieces of wood to provide additional surface for gluing.
 linguetta
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